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How Do You Strip Floor Finish With an Auto Scrubber?

Mop the stripper on, let it dwell wet, scrub with the squeegee up, recover with it down, then rinse and neutralize. Dilutions and dwell times from eight data sheets.

By the Scrubber Guide editorial teamUpdated 9 min readHow we write and fact-check

Key takeaways

  • Mop the stripper onto the floor from a bucket and fill the scrubber's solution tank with cold clean water. None of the eight stripper data sheets we read tells you to put stripper in the tank.
  • Let it dwell for the time on the label, from 3 to 5 minutes on most sheets up to 10 to 15 on one, and never let it dry.
  • Scrub first with the squeegee up and the vacuum off, then scrub again with the squeegee down and the vacuum on to pick up the slurry.
  • Stripper dilutions on the data sheets run from 1:2 to about 1:21. A product mixed at 1:25 is a scrub and recoat cleaner, not a stripper.
  • Foam does not trip the float shutoff, so put defoamer in the recovery tank before the pickup pass to protect the vacuum motor.

To strip floor finish with an auto scrubber, mop the diluted stripper onto a section from a bucket and let it dwell for the label time without drying. Fill the machine's solution tank with cold clean water only. Scrub the section with a brown or black pad, squeegee up and vacuum off. Then scrub it again squeegee down and vacuum on so the machine recovers the slurry. Finish with a rinse pass on a clean pad, neutralize, let the floor dry completely, and coat.

The squeegee-up, squeegee-down idea is the part everyone repeats. What usually goes missing is the rest: how strong to mix the stripper, how long to leave it, and whether it goes in the tank. Two answers circulate on that last point. One says fill the solution tank with stripper and let the machine apply it. The other says never put stripper in an auto scrubber. The second is right as a working rule. Every stripper data sheet below that gives application directions has you put the product on the floor, most of them by mop, and none of them puts it in the tank. Maintex's floor stripping training says plainly, "Do not put stripper in an autoscrubber."

Stripper dilutions and dwell times from data sheets

Ratios are written as each maker prints them, with ounces per gallon where the sheet gives them. That matters at stripping strength: at 1:4, a label meaning "1 part in 4 total" gives 32 oz per gallon, while one meaning "1 part plus 4 parts water" gives about 26. Our dilution ratio guide explains the difference. When a sheet prints both, measure by the ounces.

Product (maker)Light or medium finishHeavy finishWaterDwellpH
Impact (Avmor)1:10 light, 1:6 medium1:4Cold water for the rinse; mix temperature not stated3 to 5 min, keep wet10.7 to 11.7
Extreme #184 (Betco)10 oz/gal (1:12)25 oz/gal (1:5)Cold3 to 5 min, keep wet11.0 to 11.4 at dilution
Green Earth (Betco)25.6 oz/gal (1:5)SameCold4 to 5 min, keep wet10.0 at dilution
Ecolution (State Industrial)25 oz to 1 gal (1:5)SameCold5 to 10 min, reapply to prevent drying11.0 ± 0.5
Floor Science Heavy Duty (Diversey)16 oz/gal (1:8)32 oz/gal (1:4)Cool10 to 15 min, longer in cool water13
Shineline Emulsifier Plus (Spartan)1:10As strong as 1:2Warm or room temperature3 to 5 min, do not let dry13.5 to 13.7 concentrate
L.O.E. Stripper (Spartan)6 to 12 oz/gal, by build-upWithin that rangeNot stated on product pageNot stated on product page13.0 to 13.7
E-Strip (Ecore, for Ecore LVT and heterogeneous vinyl)16 oz/gal (1:8), 5 min42 oz/gal (1:3), 1 to 2 minNot statedNever more than 5 minNot stated
For contrast: Qwik-Scrub (NCL), a scrub and recoat cleaner5 oz/gal (1:25)10 oz/gal (1:12)Warm1 to 4 min9.9 concentrate

Four things stand out once the sheets sit side by side.

  • The strong end is 1:2 to 1:4, and the weak end is about 1:21. Spartan's 6 oz per gallon works out to roughly 1:21. You will see "1:30" quoted for stripping, but no stripper sheet here goes that weak. NCL's 1:25 mix is for a scrub and recoat, which removes the top coats only. If your mix is that dilute, you are top scrubbing, not stripping (the VCT guide explains when each one is the right job).
  • "5 to 10 minutes" is one label, not a rule. Most sheets say 3 to 5 minutes. Diversey asks for 10 to 15. Ecore warns that leaving E-Strip on longer than 5 minutes "may cause damage to flooring material." The one instruction every sheet shares is to keep the floor wet.
  • Water temperature is a label instruction too. Four of these products call for cold or cool water and one for warm or room temperature. Betco explains why: some strippers contain chemicals with a lower flash point, and "using hot water causes these ingredients to flash off prematurely, actually diminishing the performance of the floor stripper." Betco lists Extreme and Green Earth as cool-water strippers and Ax-It Plus, Geraldine and Vanisher as hot-water ones.
  • pH alone does not mark a stripper. Betco Green Earth works at pH 10.0, the low end of the alkaline cleaner band in our floor cleaner pH guide, while Spartan's strippers run 13 and above. The label, not the pH, tells you it is a stripper.

Step by step

Set the machine up before you mix anything, because the dwell clock starts when the stripper hits the floor.

  1. Prepare the area. Dust mop, move furniture, and barricade the room. Diversey warns that floors "will become very slippery when stripper is applied."
  2. Set up the scrubber. Fit a brown or black pad. The Nobles Speed Scrub manual describes brown as "used for stripping of floor finish to prepare the floor for recoating" and black for "aggressive stripping of heavy finishes/sealers." Our brushes and pads guide covers how pad colors vary between makers. Fill the solution tank with cold clean water. Maintex adds floor neutralizer to that water at label strength. Empty the recovery tank and add defoamer before you start.
  3. Mix the stripper in a bucket. Use the label ratio for the build-up you have, in the water temperature the label names.
  4. Mop it on. Apply it liberally to a section small enough that you can scrub it before it dries.
  5. Let it dwell, wet. Time it to the label. If the section starts to dry, re-wet it with more stripper rather than water. State Industrial's sheet says to "reapply stripper to areas to prevent drying."
  6. First pass: squeegee up, vacuum off. Scrub the section in overlapping passes. Keep solution flow off or low so you don't dilute the stripper. The stripper keeps working while it stays on the floor. Maintex repeats this pass "several times" before recovering. Nobles describes the same double-scrub method for heavy soil: squeegee up, let the solution set 3 to 5 minutes, then scrub again with the squeegee down.
  7. Second pass: squeegee down, vacuum on. Lower the squeegee, start the vacuum, and turn on clean water from the solution tank to carry the slurry into the recovery tank. Then check the floor. Spots that still look glossy or feel tacky need more stripper and another squeegee-up pass.
  8. Rinse and neutralize. Swap to a clean pad. Maintex uses "a new red scrub pad" for this. Make a full rinse pass with the squeegee down, using the cold water and neutralizer in the tank. Two rinses are normal after stripping. Stripper left on the floor dries to an alkaline film, and finish does not bond well to it (see residue and rinsing).
  9. Dry, then coat. Diversey says to let the floor "dry completely before applying" finish. Maintex adds that finish over a wet or poorly rinsed floor "will result in poor finish adhesion and appearance." Before you coat, run a pH strip test on a puddle of distilled water left on the floor for a minute.

When you finish, drain both tanks and run clear water through the solution side and the vacuum hose, so no stripper or neutralizer is waiting for the next daily scrub.

Risks specific to the auto scrubber

Stripper in the solution tank

Machine makers back the data sheets. The Nobles manual permits only "commercially approved cleaning detergents" in the tank and warns that "machine damage due to improper detergent usage will void the manufacturer's warranty." On machines with chemical-free or foam scrubbing modes, Nobles is stricter: use cool clean water under 70 F (21 C) and "do not add any conventional floor cleaning detergents, system failure may result." The quieter risk is leftover stripper: a tank that held it, used the next morning for a daily scrub, takes finish off the traffic lanes.

Foam and the vacuum motor

Emulsified finish foams heavily in the recovery tank, and a float does not stop foam. The Nobles manual warns: "Do not allow foam to enter the float shut-off screen located in the recovery tank, vacuum motor damage will result. Foam will not activate the float shut-off screen." Add a defoamer to the recovery tank before the pickup pass, and empty the tank more often than you would on a daily scrub. Many contractors use a non-silicone defoamer on strip jobs so nothing interferes with the new coats (defoamers and foam control). If foam shows at the vacuum exhaust, stop and follow the excessive foam checklist.

Squeegee and hose wear

Strip slurry carries emulsified finish and pad debris. Rinse the squeegee blades, hose and float screen the same day, because dried finish cuts airflow in a hose and stops blades sealing. On blade compounds and alkaline chemicals, see squeegee blade materials.

Hot versus cold water

Fill the tank at the temperature your stripper's label names, and never above the scrubber's limit. The Nobles Speed Scrub allows hot water up to 140 F (60 C) for conventional scrubbing. Other machines are capped as low as 104 F (40 C) (see hot water in a floor scrubber). A cool-water stripper mixed hot works worse, not better.

Where this procedure stops applying

  • No-wax floors. LVT and most sheet vinyl carry a factory wear layer, not acrylic finish. Stripping them is usually wrong (LVT and vinyl). The exception is a flooring maker that sells or approves its own stripper, as Ecore does for its LVT.
  • Linoleum, rubber and asphalt tile. Betco does not recommend Extreme on linoleum or sheet vinyl, and says to pre-test on linoleum, rubber tile or asphalt tile because "bleeding or discoloration may occur." Diversey's Floor Science stripper is not for linoleum, unsealed wood, cork or painted surfaces.
  • Chemical-free stripping. Orbital machines that strip with abrasive pads and water follow a different process. Nothing on this page about dwell or dilution applies to them.
  • Your label over this page. Each product's own sheet overrides the table above, and your operator manual overrides our machine notes.

Frequently asked questions

Can I put floor stripper in my auto scrubber's solution tank?

None of the stripper data sheets we read tells you to, and Maintex's training says "do not put stripper in an autoscrubber." Apply stripper with a mop. Fill the tank with cold clean water, plus neutralizer if your rinse product calls for it.

What dilution should I use for floor stripper?

Use the ratio on your product's label for the amount of build-up. Across the sheets we compared, heavy build-up calls for 1:2 to 1:5, and light build-up for 1:8 to 1:12. Spartan's L.O.E. goes as weak as 6 oz per gallon (about 1:21). Anything around 1:25 is a scrub and recoat strength.

Sources

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