TSP vs Degreaser: Which Pre-Paint Cleaner Wins?
TSP de-glosses and cleans in one step but is phosphate-banned in many states. Degreaser cleans only. Pick by surface, sheen, and zip code.
The 30-Second Answer
If the surface is greasy kitchen cabinets or high-gloss pre-1990 oil trim, TSP-PF wins. It cleans and lightly etches the gloss in one pass. For everything else — walls, ceilings, light dust, raw wood, drywall patches, anything in a phosphate-ban state where you’d rather not deal with the rinse — a bio-friendly degreaser like Krud Kutter or Simple Green is the right call. The two products solve different problems. Don’t pick the one your dad used. Pick the one your job needs.
At a Glance
| TSP-PF | Degreaser (Krud Kutter / Simple Green) | |
|---|---|---|
| Cuts cooked grease | 🟢 | 🟢 |
| De-glosses oil/alkyd | 🟢 | 🔴 |
| Rinse required | 🟢 (mandatory) | ⚪ (light pass or none) |
| Legal everywhere | 🟢 (PF version) | 🟢 |
| VOC / fumes | 🟢 (none) | 🟢 (low) |
| Safe on raw wood | 🔴 (raises grain) | 🟢 |
| Cost per gallon mixed | $$ | $ |
How to Tell Which Cleaner You Actually Need
Run a finger across the surface. If it skates and leaves a smear on your fingertip, that’s grease or nicotine film — TSP-PF or a strong degreaser. If the finger picks up dust but the surface feels matte and dry, it’s just household dirt — dish soap or a light degreaser will do.
Now check the sheen. Bounce a flashlight off the surface at an angle. If it throws a hard reflection (semi-gloss or gloss), new paint won’t bond without de-glossing. TSP-PF gives you a chemical assist. A degreaser doesn’t.
Last check: what state are you in? Phosphate-ban states make TSP harder to find, and the PF version is what’s on the shelf anyway. Both are fine. Don’t drive three towns over for the old stuff.
Cleaning Power
Both knock down grease. The difference is how aggressive each is and what it leaves behind.
TSP-PF is alkaline (pH around 11). It saponifies grease — turns cooked-on oil into a water-soluble soap film you can rinse away. On 15-year-old cabinet doors that have absorbed hood spatter, it’s still the fastest path from gross to paintable.
Krud Kutter Original and Simple Green Pro HD are surfactant-based degreasers. They lift grease by emulsifying it, not by chemically converting it. On kitchen cabinets they need a longer dwell time and sometimes a second pass for the worst spots. On walls and ceilings they win — gentler, no glove burn, no rinse panic.
Winner: TSP-PF on cabinets and oil trim. Degreaser on walls and general prep.
De-Glossing
This is where TSP-PF actually earns its place in 2026. A degreaser cleans. It does not chemically dull a glossy surface. New paint over a shiny alkyd or oil finish will fail at the bond line within a year if you skip the de-glossing step.
TSP-PF etches alkyd and oil paint just enough to give the new coat a tooth. It’s not a substitute for 220-grit on factory finishes or waterborne urethane, but on old-school oil trim and varnished doors, the chemical de-gloss saves you an hour of sanding and a respirator full of dust.
A degreaser leaves the gloss intact. You’d still need to scuff sand or use a liquid de-glosser before painting.
Winner: TSP-PF.
Rinse and Residue
TSP-PF leaves alkaline residue. You have to rinse. Twice. With clean water and a clean rag. Skip it and the residue interferes with paint adhesion — peeling shows up between months 3 and 12, usually at corners and edges where the rinse rag never quite reached.
Krud Kutter Original is labeled as “no rinse” for most surfaces. Simple Green Pro HD asks for a wipe-down on food-contact surfaces but most prep jobs don’t need a real rinse. Less water in the bucket, less rag swapping, less chance of running drips into baseboards.
On drywall and raw wood, this matters. Raw drywall doesn’t want repeated wet rags soaking the paper face. Bare wood doesn’t want alkaline water raising the grain. Both substrates favor the degreaser.
Winner: Degreaser.
Legality, VOC, and What’s On the Shelf
CARB and 16 other states restrict phosphate cleaners — California, New York, the Great Lakes compact (MI, WI, IL, IN, OH), most Northeast OTC states, plus a few independents. What you’ll find at Home Depot, Lowe’s, and Sherwin-Williams in those states is TSP-PF (phosphate-free), labeled as a “substitute.” Same box layout as the old stuff, different chemistry — sodium sesquicarbonate or sodium metasilicate doing the alkaline work.
Both TSP-PF and the major degreasers are low-VOC. Neither one fumes badly enough to require ventilation beyond an open window. Krud Kutter is the lowest of the bunch and the safest around kids and pets.
Real TSP with phosphates still sells in some Western and Southern states. If your soil is dead and your local nursery hates you, congrats. It’s no better for repaint prep than the PF version. The phosphate was a water-softening additive, not a cleaning agent.
Winner: Tie. Both are legal versions everywhere when you grab the PF box.
Cost and Ease
A 1-pound box of TSP-PF runs $5–8 and mixes into about 2 gallons of working solution. A quart of Krud Kutter Original runs $8–10 and goes a long way as a spray-on. Per gallon of cleaning solution, TSP-PF is cheaper by a noticeable margin.
Ease tells a different story. TSP-PF means powder, bucket, gloves, eye protection, two rinse passes, and disposal of the rinse water (don’t dump it on the lawn — it’s pH 11). The degreaser is a trigger spray. Spray, wipe, done. For a homeowner doing one bathroom, that’s 20 minutes saved. For a pro doing six cabinet boxes, it’s a real time difference.
Winner: TSP-PF on cost. Degreaser on ease. Pick your trade-off.
Verdict by Use Case
- Pick TSP-PF if: kitchen cabinets with cooked grease, pre-1990 oil trim that’s never been re-coated, varnished doors going to paint, garage walls with shop-dust film. Anywhere you want de-gloss and clean in one step.
- Pick a degreaser if: walls before repaint, ceilings, raw wood, drywall patches, anywhere kids and pets are nearby, anywhere a phosphate ban applies (use the PF version of either — they’re both fine), light dust and finger oils.
- It’s a tie when: the surface is moderately dirty waterborne trim or eggshell walls going to a new color. Both work. Pick the one in your garage.
What Will Bite You in Two Years
The peeling job almost always traces back to one of two skipped steps. Either someone used TSP and didn’t rinse, leaving alkaline residue under the new coat. Or someone used a degreaser on glossy oil trim and didn’t sand or de-gloss, so the new paint never bit. Both look fine the day you finish. Both fail by month 12. Pick the right cleaner for the surface, then do the second step (rinse for TSP, sand for degreaser-over-gloss). That’s the whole trick.
Top Picks by Side
Going with a degreaser? See the best paint for kitchen cabinets round-up — every pick there has a prep section that calls out the right cleaner for that finish.
Going with TSP-PF on oil trim? Read the oil vs water-based paint comparison before you choose the topcoat. Switching systems changes the prep.
Related
Frequently asked questions
Is TSP actually banned?+
Do I need to rinse TSP off before painting?+
Can I use dish soap instead?+
Will TSP de-gloss like sandpaper does?+
- Best paint for kitchen cabinets
- Oil-based vs water-based paint
- How to prep walls for painting