Best TSP Substitutes and Pre-Paint Cleaners

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Top pick: Krud Kutter Pre-Paint Cleaner / TSP Substitute. It costs $20 to $26 a gallon, it works at full strength straight from the jug, and it is the only cleaner here that cleared our smoke-film and adhesion tests without a rinse step. Krud Kutter wins on convenience and on paint bonding. It falls short on value, because you are paying to ship water, and on gloss knock-down, where it moved our semi-gloss trim panel by five gloss units and nothing more. If you are washing an entire house, Savogran Phosphate-Free TSP-PF mixes 18 gallons of solution out of a $12 box. If the soil is cooked-on kitchen grease, Krud Kutter Original. If the surface is slick, Gloss-Off.

Six products, four soils, one honest answer per job.

What TSP Did, and What the Substitutes Actually Replace

Trisodium phosphate was never a magic paint product. It is a strongly alkaline salt that saponifies grease and, as a side effect of that alkalinity, slightly etches oil-based gloss films. Painters loved it because one cheap box did two jobs at once: it degreased and it dulled.

The phosphate-free substitutes replace half of that. They clean, in some cases better than TSP, using sodium metasilicate, sodium carbonate, or surfactant blends. What they do not do is etch. I put a 60-degree gloss meter on a semi-gloss alkyd trim panel and wiped it with each product. The TSP substitutes moved the reading 4 to 6 gloss units, which is inside the range of “I wiped the dust off”. Krud Kutter Gloss-Off moved it 33 units. That is the whole difference in one number.

So if someone tells you a TSP substitute is a drop-in swap, they are half right. It swaps in for the cleaning. For the deglossing you need a second product or a sanding sponge, and the sanding versus deglosser comparison covers which is faster on which surface.

The other thing worth knowing: real TSP has not been outlawed. Savogran still sells it. Phosphate restrictions in many states pushed it off consumer shelves and out of some retail channels, and Klean-Strip discontinued its own TSP powder, but the box exists. For the full chemistry, we have a dedicated explainer on what a TSP substitute is.

How I Tested

Thirty maple cabinet doors from two 1990s kitchens, painted drywall panels pulled from a smoking household after four months, semi-gloss alkyd trim panels for gloss measurement, and weathered cedar and vinyl siding carrying chalk plus north-side mildew. Every cleaner ran at its label strength on every soil, and every cleaned panel then got the same waterborne acrylic enamel, seven days of cure, and a cross-hatch tape pull per ASTM D3359. No-rinse claims got a pH strip pressed to the dried, uncoated surface. Two cabinet refinishers and one exterior painting contractor told me what they get called back for.

The Six Picks Side by Side

Price is per container, not per usable gallon. TSP-PF and the liquid concentrates all come out cheaper than they look once diluted; the ready-to-use jugs come out more expensive.

Pick by the Job in Front of You

• Repainting interior walls and trim, normal household soil: Krud Kutter Pre-Paint Cleaner.
• Washing a whole house exterior, or a basement, or a garage: Savogran TSP-PF.
• One weekend, interior trim plus a brick porch plus a metal railing: Klean-Strip TSP Substitute.
• Kitchen cabinets, especially the doors near the range: Krud Kutter Original, then Gloss-Off.
• Glossy trim or doors you are not going to sand: Gloss-Off on its own.
• Siding with visible mildew or algae: Mold Armor E-Z House Wash first, TSP-PF after if the wall chalks.

The Picks in Detail

Krud Kutter Pre-Paint Cleaner / TSP Substitute, Top Pick

The jug that does what the category name promises. Full strength, no dilution, no rinse, no odor worth mentioning. Rust-Oleum’s label claims it cleans and deglosses; it cleans very well and deglosses about as much as a damp rag, which I will come back to.

On the smoke-filmed drywall panels this was the standout. Nicotine film is nasty because it is sticky, slightly acidic, and it bleeds. One pass with a saturated microfiber took the panel from visibly amber to clean white on the cloth, and the pH strip on the dried surface read 8. The painted panel scored 4B on cross-hatch, matching the scrubbed-and-clear-water-rinsed control panel. That is the result that earns the top pick: skipping the rinse cost nothing measurable in adhesion.

Wallpaper paste residue is the other place it shines. If you have just stripped a room and the wall still feels faintly tacky in patches, this clears it in one wipe where plain water just reactivates the glue and moves it around.

The cost math is the honest weakness. At roughly $22 a gallon ready to use, you are paying about four times per usable gallon what TSP-PF powder costs. For a bathroom and a hallway that difference is a few dollars and worth it. For a 2,600 sq ft house repaint it is real money.

The second weakness is the deglossing claim. Semi-gloss trim went from 52 to 47 gloss units. That is a scuff. If the surface is slick, buy Gloss-Off or reach for 220-grit.

Buy it if you are prepping interior walls, trim, and doors with ordinary household soil and you want to clean and paint the same afternoon. Skip it if the job is a whole-house wash, or if the surface is high-gloss and you were hoping to avoid sanding.

Savogran Phosphate-Free TSP-PF, Best Value

A cardboard box of white powder that costs about $12 and mixes roughly 18 gallons of wash water. Nothing else here comes close on cost per gallon, and on the two soils where alkalinity matters most, it also happens to clean the hardest.

Chalked exterior paint is the test that separates this pick from the pack. Weathered acrylic siding sheds a fine powder of degraded binder, and if you paint over it, the new coat bonds to loose dust and lets go in about two seasons. I dragged a black nitrile glove down a cedar test section after each cleaner. Mold Armor left a heavy chalk stripe on the glove. Klean-Strip left a moderate one. TSP-PF left the glove clean after one wash and rinse. That is why exterior painters still keep a box in the truck. The exterior wood prep guide walks the full sequence for siding.

The rinse is not optional and people skip it constantly. Alkaline salt residue dries as a barely visible white bloom, and topcoat over that bloom fails a tape pull immediately. My unrinsed control panel scored 1B. The rinsed panel scored 5B.

Two more small things. Dissolve the powder in warm water, not cold, and give it a minute; undissolved grit streaks a wall and scratches soft latex. And wear the gloves. This is not dish soap, and a bare hand in a strong TSP-PF bucket goes slick and raw fast. Our painting respirator round-up covers when you also want eye and lung protection, which for overhead ceiling washing is always.

Buy it if you are washing a large area, a chalky exterior, or a soot-filmed basement and you do not mind pulling a hose. Skip it if you cannot rinse, which usually means finished floors, or you only need a quart’s worth.

Klean-Strip TSP Substitute, Best Big-Box Liquid

The bottle on the paint-prep aisle at both big boxes, in quart (QKTP348) and gallon. It is a liquid, so it goes into cold water without the grit problem, and Klean-Strip rates it for wood, brick, and metal, which makes it the practical single bottle when your weekend covers three substrates.

Middle of the pack on performance, which is where a middle-priced generalist belongs. It cleared normal wall grime in one pass and the nicotine panel in two. On the range-adjacent cabinet door it took two passes and still left a faint tack that Krud Kutter Original cleared in one. Cross-hatch after painting scored 4B when I rinsed and 3B when I did not, so I would call this a rinse-on-heavy-soil product regardless of what the shelf tag suggests.

One warning that is genuinely about shopping rather than chemistry. Klean-Strip discontinued its real TSP powder, so the person who has been buying that blue box for fifteen years now picks up this bottle expecting the same gloss-dulling behavior. It does not dull gloss. It cleans.

Buy it if you want one affordable bottle that covers interior trim, masonry, and metal on the same job. Skip it if the primary soil is cooked kitchen grease.

Krud Kutter Original Cleaner & Degreaser, Best for Greasy Cabinets

The gallon jug most people already own. Concentrated, EPA Safer Choice listed, and by a clear margin the strongest thing here on polymerized cooking oil.

Grease above a range is not household dirt. It has cross-linked into a hard amber film that a general cleaner smears rather than lifts. Full strength Krud Kutter Original took our worst door from tacky and yellow to squeaky in a single wipe with a green scrub pad. Nothing else in the round-up did that in one pass. Both cabinet refinishers I called use it, and both said the same thing about it: rinse.

That is the con, and it is not a small one. This is a surfactant-heavy formula, and surfactant left on a door is a bond breaker sitting exactly where you need adhesion most. My unrinsed cabinet panel dropped to 2B on cross-hatch. The clear-water-rinsed panel came back to 4B. Rinse, dry, then prime. The full sequence lives in the kitchen cabinet painting project, and the coating that goes over it is covered in the best kitchen cabinet paint round-up.

It also suds heavily in a bucket, which makes it hard to track what you have already cleaned on a stack of identical doors, and it raises grain on bare wood. Keep it off anything headed for stain.

Buy it if the soil is grease. Skip it if you cannot rinse, or the wood is going to be stained rather than painted.

Krud Kutter Gloss-Off, Best Clean-and-Deglaze in One

This is the pick that fills the gap the whole category leaves open.

Gloss-Off is a no-rinse liquid deglosser that also cleans. On the trim panel it dropped 60-degree gloss from 52 to 19 units in one wipe, and the panel painted over it scored 5B on cross-hatch, the best adhesion number of the entire test. The label says recoat any time after ten minutes, and in practice that held: I painted a wiped panel at twelve minutes with no lifting, no crawling, no fisheye.

Profiled doors are where it earns its money. A raised-panel door has coves and beads that a sanding sponge cannot reach without rounding the profile, and Gloss-Off gets into all of it with a cloth.

It is a deglosser that cleans, not a cleaner that deglosses. On the greasy range doors it was mediocre, leaving a film that Krud Kutter Original had cleared. Use it second, not first. And 32 oz is the only size, so a full kitchen takes two bottles.

One more limit, because I would rather say it than let someone find out the hard way. Factory conversion-varnish cabinet finishes are chemically cured and extremely slick, and no liquid deglosser fully solves them. Scuff sand and use a bonding primer on those, whatever the bottle promises.

Buy it if you are painting glossy trim, doors, or cabinet faces and want to skip sanding on profiles. Skip it if the surface is greasy, or the finish is factory conversion varnish.

Mold Armor E-Z House Wash, Best for Exterior Siding

Exterior prep is two separate problems, and this bottle solves one of them completely.

Mildew and algae are living growth. Wash them with a detergent and you smear spores across the wall, then paint over them, then watch black spotting come back through a brand-new coat within a season. Bleach chemistry kills them outright. Mold Armor E-Z House Wash is a bleach-based concentrate that runs through a hose-end applicator or a pressure washer, and on our north-side vinyl and cedar sections the mildew was gone after one application and a rinse with no scrubbing.

What it does not do is chalk. The glove test after washing left a heavy chalk stripe on weathered cedar. So on any siding older than about eight years, this is the first wash, and TSP-PF is the second. On a house with active mildew and no chalking, one wash is enough. If you are dealing with paint that is already lifting, the exterior peeling paint fix is the diagnostic to run before you buy any of this.

Budget an hour for the landscaping. Bleach at wash concentration kills plants. Pre-wet the beds, cover what you can, rinse everything afterward. Keep it away from bare aluminum and unsealed masonry, and never mix it with an ammonia cleaner.

Buy it if the siding has visible mildew or algae. Skip it if the wall is only chalky and dirty, because TSP-PF alone does that job cheaper.

Rinse or No Rinse, and Why People Get It Wrong

The no-rinse claim is not marketing on every bottle. It is real on some and soft on others, and the difference shows up in a tape pull.

Genuinely no-rinse in my testing: Krud Kutter Pre-Paint Cleaner and Gloss-Off. Both dried to a pH of 8 or lower, both scored 4B or better painted over, both are formulated to leave a paintable film rather than a soap film.

Rinse required, no argument: Savogran TSP-PF, real TSP, and Mold Armor E-Z House Wash. Alkaline salts and bleach residue both wreck adhesion, and my unrinsed TSP-PF panel scored 1B, which in plain terms means the paint peeled off with the tape.

Soft claims: Klean-Strip TSP Substitute and Krud Kutter Original. Both are fine unrinsed on light soil. Both leave enough behind after heavy-duty work that I would rinse anyway, especially on cabinets where every square inch is a wear surface.

The field test costs nothing. Let the cleaned surface dry, then wipe it with a clean black cloth. Anything that transfers is something your paint would otherwise have to bond through.

Where Pre-Paint Cleaning Goes Wrong

• Cleaning with a rag that is already dirty. You are redistributing grease. Two buckets, two cloths, change them often.
• Using a general cleaner on cooked-on grease. Household spray moves polymerized oil around. Full-strength degreaser lifts it.
• Skipping the rinse on a powdered cleaner. The white bloom is invisible until the topcoat fails a year later.
• Expecting a substitute to dull gloss. It will not. Deglosser or sandpaper.
• Washing siding and painting the next morning. Wood needs 24 to 48 hours, longer on the north side.
• Bleach and ammonia in the same bucket. Never. Two washes, clear rinse between them.
• Cleaning and then touching everything with bare hands. Skin oil on a freshly cleaned cabinet door is a real adhesion defect. Wear the gloves through priming.

Application Notes

• Work bottom to top on walls, rinse top to bottom. Cleaner running down a dirty wall leaves streaks that show through paint; rinse water running down a clean wall does not.
• Give it dwell time. Sixty seconds on the surface does more than sixty seconds of scrubbing. Most people wipe too fast.
• Change the water when it looks like tea. A dirty bucket is a redistribution system.
• Test the dried surface before you open the paint. Black cloth, one wipe, look at it.
• Prime what you exposed. Cleaning opens up porosity in patched and previously stained areas, which is why a washed wall sometimes flashes under one coat.

Also Considered, Also Rejected

• Savogran real Trisodium Phosphate. Still sold, still excellent, still the only product that cleans and dulls in one step. Left out of the main picks because phosphate handling and disposal rules vary by state and most readers want the substitute. If your state allows it and you have a hose, it is the cheapest complete answer on the shelf.
• Savogran Liquid TSP Substitute. Genuinely good, one gallon makes up to 16, and no-rinse per the label. It lost the liquid-concentrate slot to Klean-Strip on retail availability alone.
• Savogran Dirtex. Fine no-rinse wall cleaner in powder and spray. Overlapped Krud Kutter Pre-Paint Cleaner without beating it on anything.
• Simple Green All-Purpose Cleaner. Everyone has a bottle. It is a general cleaner, not a pre-paint cleaner, and it leaves enough surfactant behind that unrinsed panels underperformed on adhesion.
• Dish soap and water. Works on light dust. Leaves soap film. If you go this route, rinse twice.
• Sugar soap. UK product, hard to source in US retail, no advantage over what is here.

Wash it, check it with a black cloth, then paint. If you buy one bottle for a normal interior repaint, make it the Krud Kutter Pre-Paint Cleaner. If you are standing at the bottom of a ladder looking at a whole house, buy the box of TSP-PF and a hose nozzle instead.