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Chemistry and Foam

Can You Use Dish Soap, Pine-Sol, Simple Green or Vinegar in a Floor Scrubber?

Dish soap and vinegar, no. Pine-Sol, not by its own label. Simple Green, only where its maker names floor scrubbers. Eight operator manuals and four labels compared.

By the Scrubber Guide editorial teamUpdated 11 min readHow we write and fact-check

Key takeaways

  • Do not put dish soap in a floor scrubber. P&G sells Dawn Professional for "2X longer lasting suds", and all eight operator manuals we read ask for low-foam detergent. Tennant warns foam "may not activate the shut-off float".
  • Pine-Sol's own floor directions say "Mop, wipe or spray". No machine is mentioned, and the original pine formula's concentrate is pH 3.5 while the scented ones are pH 10 to 11.
  • Simple Green All-Purpose Cleaner is the only one of the four whose maker names floor scrubbers, on its Australian janitorial page. Its US page does not, and its lightest listed dilution, 1:30, is about 4.3 oz per gallon.
  • Vinegar is at least 4 percent acetic acid, and the Minuteman E14 manual says "Never use acid solutions which could damage the machine and/or persons."
  • The rule in five of the manuals is a cleaner made for scrubbers: low foam, non-flammable and labeled for machine use. Tennant voids the warranty for machine damage from improper detergent.

No for dish soap and vinegar, and no for Pine-Sol as its label is written. Simple Green All-Purpose Cleaner is the one household product whose maker names floor scrubbers, and even that comes with a dilution problem. All eight operator manuals we read ask for a low-foam detergent, and five of them go further: the cleaner must be made or intended for machine use. A product sold for the sink or the mop bucket does not meet that test, however well it cleans by hand.

Two answers circulate. One says a scrubber is just a powered mop, so whatever you mop with goes in the tank. The other says only the machine maker's own branded chemical is safe. The first is wrong because a scrubber has something a mop bucket does not: a vacuum motor sitting above a recovery tank, protected by a float that foam cannot lift. The second is too strict. The manuals do not demand the maker's own brand. They ask for a type of product: low foam, non-flammable, free of the acids and solvents they name, and labeled for machine use. Plenty of janitorial floor cleaners meet that description.

What the operator manuals actually allow

We read the chemical instructions in eight operator manuals from seven brands. The wording below is each manual's own.

ManualFoam ruleOther limits in the same section
Tennant T1 Battery (9008591)"Pour an approved low foaming cleaning detergent""Only Use Commercially Available Floor Cleaners Intended for Machine Application." Improper detergent use "will void the manufacturer's warranty"
IPC CT15, CT30, CT45, CT46Designed for "low-foam biodegradable detergents made specifically for scrubber driers""Do not use solvents or hydrocarbons." No bleach or other oxidants
Kärcher BD 50/50 C Bp Classic (59656380)"Do not use highly foaming detergents."Free from "solvents, hydrochloric acid and hydrofluoric acid". With other detergents "the operator bears the increased risk"
Kärcher BD 50/55 C Classic Bp (97722910)"Do not use heavily foaming detergent."Free of "solvents, salt and hydrofluoric acid"
Minuteman E14 (988760 Rev A)"Always use low foam detergent.""Never use pure acids." "Never use acid solutions which could damage the machine and/or persons"
Clarke CA30 20B (56091130)"Only low foam, nonflammable detergents may be used.""These detergents must be suitable for the use of scrubbers."
Nilfisk Advance SC6000"Use only low-foaming, non-flammable liquid detergents""intended for machine application"
Viper AS430C (VF90031-US)"Only low foam, nonflammable detergents may be used.""These detergents must be suitable for the use of scrubbers."

Foam is the one rule all eight share, and the reason is in two of the manuals. Tennant: "Foam may not activate the shut-off float. Foam intake may damage machine and void the manufacturer's warranty." Minuteman tells E14 owners to use "only a minimal percentage of detergent to prevent formation of an excess quantity of foam since too much foam may damage the vacuum motor." Our recovery tank and float shutoff guide explains why a float that stops water lets foam straight past.

The second shared idea is purpose. Tennant, IPC, Clarke, Nilfisk and Viper all say the detergent must be intended for, made for, or suitable for scrubbers or machine application. Kärcher states it as risk: use other detergents and the operator carries it.

Four household products against those rules

These are the labels, product pages and Safety Data Sheets we read. The pH figures are for the concentrate as sold, because that is what the SDS reports. None of these makers publishes the pH of the diluted solution.

ProductMaker's own directionsConcentrate pH (SDS)Machine use named by maker?Verdict
Dawn Professional Manual Pot and Pan Detergent1 oz per 10 gallon sink; sold for "2X longer lasting suds"9 (P&G SDS, May 2021)No. Its listed uses are sinks, counters, windows, tile walls and similarNo
Pine-Sol Original PineSDS recommended use: "General Purpose Cleaner"3.5 (Clorox SDS, May 2016)NoNo
CloroxPro Pine-Sol Multi-Surface Cleaner (scented)"Dilute 1 fl. oz per gallon of water. Mop, wipe or spray"10 to 11 (Clorox SDS, February 2019)NoNo
Simple Green All-Purpose CleanerLight cleaning up to 1:30, general purpose up to 1:108.0 to 10.0 (SDS 13000-25A, October 2025)Yes, on the Australian janitorial page; not on the US product pageOnly if your manual or dealer approves it
White or cleaning vinegarNot a cleaner labelNot on an SDS we read; at least 4 g acetic acid per 100 mL (FDA)NoNo

Dish soap: built to do the one thing a scrubber cannot handle

Dish soap is the worst choice on the list. P&G describes Dawn Professional's "mix of proprietary surfactants" as cleaning "double the pots and pans per sink with 2X longer lasting suds." Long-lasting suds are the selling point in a sink and the failure mode in a recovery tank. P&G's list of extra uses runs from three-compartment sinks and countertops to windows, trash receptacles and tile walls. Floors are not on it. Our excessive foam guide lists dish soap among the products not made for auto scrubbers, and covers what to check when a recovery tank fills with suds.

Pine-Sol: one name, opposite ends of the pH scale

"Pine-Sol" is not one chemistry. Clorox's 2016 SDS for Pine-Sol Original Pine lists sodium lauryl sulfate at 10 to 20 percent, pine oil at 5 to 10 percent and a pH of 3.5. Its 2019 SDS for the scented Multi-Surface Cleaner lists alcohol ethoxylates at 1 to 5 percent and a pH of 10 to 11. A person asking whether "Pine-Sol" is safe is asking about two different products.

Neither names a machine. The Original SDS gives its recommended use only as "General Purpose Cleaner". CloroxPro's label for the scented concentrate says "Dilute 1 fl. oz per gallon of water. Mop, wipe or spray with this product solution," and adds that it is not recommended at full strength on copper or aluminum. Pine-Sol meets none of the five manuals' tests for a cleaner intended for machine use, and the acidic original sits awkwardly against Minuteman's ban on acid solutions. Check what a diluted solution reads with a pH strip before it goes near a stone floor, as our floor cleaner pH guide explains.

Simple Green: the one exception, with a catch

Simple Green's Australian janitorial page says the All-Purpose Cleaner "can be used manually or in equipment such as floor scrubbers, carpet cleaners, pressure washers and parts washers." The October 2025 SDS lists it as non-flammable with a flash point above 212 F. That clears two of the manual tests. It does not clear the foam test on paper, because neither page calls it low foam, and the US product page we read does not mention scrubbers at all.

The catch is the dose. Simple Green's lightest listed dilution is "up to 1:30", which is 128 divided by 30, or about 4.3 oz per gallon. That is more than four times the dose of a floor cleaner labeled at 1:128 (1 oz per gallon), and Minuteman tells E14 owners to use "only a minimal percentage of detergent" precisely to keep foam down. The dilution ratio guide has the conversion, and residue and rinsing covers what too much product leaves behind. The US page also says not to use it on unfinished wood.

If your manual calls for an approved detergent, as Tennant's does, ask your dealer before you rely on the Australian page. Tennant's T1 manual says plainly: "Contact your dealer for recommended cleaning detergents."

Vinegar: an acid, and the manuals that address acids say no

FDA's compliance guide says vinegar "should contain 4 grams of acetic acid per 100 mL." That makes it an acid solution by definition. Minuteman's E14 manual says "Never use acid solutions which could damage the machine and/or persons." Kärcher names only hydrochloric and hydrofluoric acid, so it does not ban vinegar by name. That is the source of the confusion: a manual that does not mention vinegar has not approved it. Tennant's rule still applies, since vinegar is not a commercially available floor cleaner intended for machine application.

The floor matters as much as the machine. Marble, limestone and the marble chips in terrazzo react with acids, which is why our terrazzo and natural stone guide keeps vinegar off them.

The five-question test for any cleaner

  1. Does the label name auto scrubbers, floor machines or machine application? If not, it fails the test in five of the eight manuals.
  2. Is it low foam? All eight manuals ask for it. "Suds" on the label is a no.
  3. Is it non-flammable? The SDS will say. Clarke, Nilfisk and Viper require non-flammable detergents, and Tennant says "Do Not Use Flammable Materials."
  4. Does it contain anything your manual bans? Look for solvents, hydrocarbons, acids, salt and oxidizers such as bleach. Our bleach and disinfectant guide covers the oxidizer rule.
  5. Is it on your maker's or dealer's approved list? Tennant voids the warranty for machine damage from "improper detergent usage".

A low-foam neutral floor cleaner labeled for auto scrubbers passes all five, which is why it is the daily default.

If dish soap or another product is already in the tank

  1. Watch the recovery tank. Tennant says that if foam or liquid begins to leak from the machine, shut it off immediately.
  2. Drain both tanks and rinse them with clean water.
  3. Run clean water through the solution system. Nilfisk's SC6000 manual says to purge the dosing system "of previous detergent when switching to a different detergent", and the same logic applies to the lines of a conventional tank.
  4. Do not mix products to fix it. Minuteman warns: "Never mix different types of detergents: this could generate noxious gases." Simple Green's SDS says not to mix it with "oxidizers, acids, bathroom cleaners, or disinfecting agents."
  5. Rinse the floor. A clear water pass lifts what the first product left behind.

If foam is unavoidable for a job, Minuteman's E14 manual puts a small amount of anti-foam in the recovery tank before work starts. Our defoamer guide explains why it belongs there and not in the solution tank.

Where this answer stops applying

  • Chemical-free modes. Machines running ec-H2O, FaST or a similar system have their own water and detergent rules, set out in their manuals. See chemical-free scrubbing.
  • Built-in dosing systems. Machines that meter concentrate from a cartridge, like the SC6000 EcoFlex, want plain water in the tank. The concentrate goes in the cartridge, and changing products means purging. Our chemical dosing systems guide covers these.
  • Other formulas and countries. The pH figures above come from the SDS versions listed. Formulas change, and one brand's pages can say different things by country, as Simple Green's do.
  • Your manual overrides this page. We read eight manuals. A different model from the same maker can carry different rules.

Frequently asked questions

Can I use dish soap in my floor scrubber?

No. Dish soap is sold for long-lasting suds, and all eight operator manuals we read ask for low-foam detergent. Tennant warns that foam may not activate the shut-off float and that foam intake may damage the machine and void the warranty.

Can I put Pine-Sol in an auto scrubber?

Not according to its label. CloroxPro's floor direction is to mop, wipe or spray at 1 fl oz per gallon, and no machine use is mentioned. The original pine formula's concentrate is pH 3.5 and the scented formulas are pH 10 to 11, so "Pine-Sol" covers two different chemistries.

Is Simple Green safe for floor scrubbers?

Simple Green names floor scrubbers among the equipment its All-Purpose Cleaner can be used in, on its Australian janitorial page. It is non-flammable, but it is not labeled low foam, and its lightest listed dilution of 1:30 is about 4.3 oz per gallon. Check your manual's approved list or ask your dealer first.

Can I use vinegar in a floor scrubber?

No. Vinegar is at least 4 percent acetic acid, Minuteman's E14 manual says never to use acid solutions, and no manual we read lists it as a machine cleaner.

Sources

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