Mold Killer: What the EPA Label Allows, Product by Product

The pages that rank for this search are shelves: a home centre listing, a marketplace bundle, a brand collection. None shows the document that decides what a spray may claim, which is the label EPA accepted under federal pesticide law. We read eight and set out what each says; we did not test the products, so nothing below is a ranking.

What makes a product a legal mold killer

Mold is a fungus, and EPA classes products that mitigate the growth of fungi, bacteria and viruses as antimicrobial pesticides. Under federal law they must be registered before sale. 40 CFR 152.15 sets the trigger: a seller’s claim, on the label or anywhere else, that the product can or should be used as a pesticide. ‘Kills mold’ is that claim.

Registration fixes the label’s contents, listed in 40 CFR 156.10, and EPA's label guidance quotes the line printed on every one: it is a violation of federal law to use this product in a manner inconsistent with its labeling. In EPA’s words, the label is the law.

Label element	What it tells you	40 CFR
EPA Reg. No.	Which registration the product is sold under	156.10(e)
EPA Est. No.	The factory that produced the batch	156.10(a)
Ingredient statement	Each active ingredient and its percentage, normally on the front panel	156.10(g)
Signal word	Danger, Warning or Caution, by toxicity category	156.64
Directions for use	Surfaces, dilution and the contact time behind each claim	156.10(a)

One registration can be sold under many names. Under 40 CFR 152.132, a distributor product keeps the registrant’s label but may change the product name, and adds the distributor’s company number to the registration number. The PPLS record for 4091-23 lists ‘Mold Armor Mold & Mildew Killer + Quick Stain Remover’, the top result for this search, as an alternate brand name. Search the number, not the name.

Look up any label in five steps

EPA PPLS (the Pesticide Product and Label System) is EPA’s public library of stamped, accepted labels, and the source for every product row here.

1. Copy the number after ‘EPA Reg. No.’ from the bottle. If it has a third part, it is a distributor product; search the first two.
2. Enter it in the PPLS registration number field. EPA’s search page notes product names vary, so the number works better.
3. Open the newest label PDF. EPA notes several PDFs may be needed to establish a product’s current terms.
4. Read the mold or mildew line under Directions for Use: the surface, the contact time, and the verb (kill, control, inhibit or remove stains).
5. Compare the ingredient statement with your bottle. EPA notes marketplace labels can differ from PPLS copies and states may be stricter.

PPLS does not hold supplemental distributor labels, per its search page. That matters for RMR-141, the marketplace bundle in this search’s top results. Its RMR-141 RTU safety data sheet, issued by RMR Solutions, gives EPA Reg. No. 61178-2, which PPLS lists as Microgen’s Public Places. The Public Places label is the federal label behind it, and its mold line is a mildewstat claim, not a kill claim.

Eight registered products, read from their labels

These eight span the chemistries on a retail shelf or a restoration supply order, including the top-ranking brands. Each row comes from the EPA-stamped label in PPLS: the comparison a ‘best mold killer’ list needs and none prints.

Product	EPA Reg. No.	Active ingredient and %	Mold claim	Contact time	Surfaces
Clorox Plus Tilex Mold & Mildew Remover	5813-24	Sodium hypochlorite 2.4%	Kill mold and mildew; prevent	5 min nonporous; 10 min grout, cement	Tile, grout, cement; optional text excludes wood, painted surfaces
Mold Armor Mold & Mildew Killer + Quick Stain Remover	4091-23	Sodium hypochlorite 4.0%, sodium carbonate 1.0%	Kill mold and mildew; mildewstat; stains	60 seconds; 10 min for stains	Hard non-porous; fabric mildewstat on cotton, polyester
X-14 Mildew Stain Remover	71903-1	Sodium hypochlorite 4.00%	Disinfectant against Aspergillus niger	5 min	Hard non-porous; sealed grout
RMR-141 RTU (Public Places registration)	61178-2	Two quats, 0.07% each	Mildewstat: control mold and mildew	None: wet, air dry, repeat weekly	Pre-cleaned hard non-porous
Vital Oxide	82972-1	Chlorine dioxide 0.2%, two quats 0.125% each	Mildewstat; kill mold and fungi	10 min	Floors, walls, ceilings, fabric
Benefect Botanical Daily Cleaner Disinfectant Spray	84683-3	Thymol 0.05%	Control mold and mildew	10 min wet; repeat weekly	Pre-cleaned hard non-porous
Concrobium Mold Control	82552-1	Sodium carbonate 0.95%	Fungistat: inhibits, prevents	None: wet evenly, let dry	Wood, wallboard, fabric, concrete, block
TOMI BIT Hydrogen Peroxide 7.5% RTU	90150-1	Hydrogen peroxide 7.5%	Mold control, ‘aesthetic purposes only’	Set by BIT equipment	Sealed rooms up to 3,663 cu ft; not textiles or hard porous

The pattern: hypochlorite labels carry the shortest kill times and confine them to hard surfaces, while the low-percentage Concrobium and Public Places labels are inhibitors, applied after cleaning to keep growth from returning.

Contact time is the claim

A kill claim is tied to a time the surface must stay wet; spray and wipe at once and the claim has not been met. Per the labels that print one, it runs from 1 to 10 minutes.

The Tilex label shows why surface matters. Hard nonporous: let stand 5 minutes. Hard porous surfaces such as grout and cement: 10 minutes, rinse, repeat if needed. It also warns it may not remove mildew embedded in old grout or silicone caulking.

Nothing on these labels works instantly

The EPA letter in the X-14 label file answers the ‘kills mold instantly’ question. Accepting the label in 2008, EPA allowed a disinfectant claim against Aspergillus niger at a 5 minute contact time and removed ‘works on contact’, ‘works instantly’ and a claim to remove mildew faster than competitors. The fastest direction here is 60 seconds, per the Mold Armor label.

Kills, removes stains, prevents: three different promises

Retail titles merge these, as in ‘killer and quick stain remover’. On the label they are separate directions with separate conditions. Reading them apart is most of choosing a mold killer spray.

Claim type	Label wording	What it requires	What it does not promise
Kills	‘Kill mold & mildew’	A wet contact time on a named surface	That the stain goes, or that growth will not return
Removes stains	‘To remove mildew stains’	Wait until stains disappear (Tilex) or 10 min (Mold Armor), rinse	That anything was killed
Controls or inhibits	‘Mildewstat’, ‘fungistat’	Pre-cleaned surface, wet, air dry, repeat	That existing growth is dead or gone
Prevents for a period	‘Repeat every 7 days’, ‘every 28 days’	Reapplying at the printed interval	Protection past the interval or on unlisted surfaces

The Mold Armor label prints two prevention schedules: every 7 days on hard surfaces and every 28 days on cotton and polyester fabric. The Public Places and Benefect labels say repeat weekly or when growth reappears. And the Concrobium label says mold stains may remain visible after treatment and not to expect it to whiten them; the Vital Oxide label says the same. Colour is a separate job, covered on our mildew remover page.

The active ingredient classes

Every registered mold product names its actives, and they fall into a few classes. The class sets the surface limits and the hazard more than the brand does.

Class	Labels here	What the labels allow	Limits
Sodium hypochlorite	Tilex, Mold Armor, X-14	Short kill times; bleaches stains	Hard surfaces; reacts with ammonia and acids
Quaternary ammonium	Public Places (RMR-141)	Caution signal word	Mold line is a mildewstat
Chlorine dioxide plus quats	Vital Oxide	10 min kill; fabric mildewstat	Will not whiten stains
Hydrogen peroxide	TOMI BIT 7.5%	Whole-room treatment with BIT equipment	Danger signal word; sealed, cleaned, dry non-porous only
Thymol (botanical)	Benefect	Caution signal word	Control claim, weekly repeat
Sodium carbonate	Concrobium	Wood, wallboard and fabric	Fungistat; no kill claim
Mildewcide in paint	Perma-Guard coating	Protects the dry paint film	Existing mold removed first

That answers the ‘mold killer for walls’ and ‘mold killer for wood’ searches. Painted walls and bare wood fall outside the hypochlorite directions on the Crescent label, which says not to use it on wood or painted surfaces unless you plan to refinish them. For cleaned, dried wood, the label that lists it is a fungistat such as Concrobium. For grout, see our mold in shower page.

Mold killer paint is a coating, not a cure

The Perma-Guard label file for Perma-Guard, a registered mildewcide paint, tells painters to remove all existing mold first. Accepting it in 2010, EPA ordered ‘Proof’ deleted from the product name as false and misleading. The paint protects its own film, not the wall behind it. Vinegar has no registration and so no label to compare; our vinegar page covers the studies.

Why EPA puts removal and moisture ahead of killing

EPA's commercial remediation guide is blunt: the purpose of remediation is to remove the mold, and it is necessary to clean up contamination, not just kill it, because dead mold is still allergenic. It says routine biocide use is not recommended and that sterilizing an area is usually neither possible nor desirable.

EPA's homeowner cleanup page says to scrub mold off hard surfaces with detergent and water, and that ceiling tiles and carpet may have to be thrown away. EPA's Brief Guide to Mold adds the numbers that decide whether growth returns: dry water damage within 24 to 48 hours and keep indoor humidity below 60 percent, ideally 30 to 50 percent. The labels agree: the Concrobium label requires correcting conditions favorable to mold before use, and per the BIT and Vital Oxide labels, drying to below 20% moisture content is part of the programme. Bleach’s own evidence and hazards are on our does bleach kill mold page.

Signal words and mixing rules

Per 40 CFR 156.64, toxicity category I labels carry DANGER, category II WARNING and category III CAUTION; category IV needs none. Of the eight, only TOMI BIT reads Danger and only Concrobium carries none; the hypochlorite labels read Warning.

Mixing is where people get hurt. The Crescent label names ammonia products, toilet bowl cleaners, rust removers, vinegar and acids as releasing hazardous gases with bleach, and EPA's Brief Guide to Mold gives the same bleach and ammonia rule. Use one product at a time, rinse between products and ventilate as the label directs.

Which situation are you in?

Find your row, then read the matching label line before buying. The 10 square foot line is EPA’s: per its homeowner guidance, a patch under roughly 3 ft by 3 ft is usually a job you can handle yourself.

Your situation	Label to look for	What decides it
Small patch on tile or grout, under about 10 sq ft	Hypochlorite label listing grout	Full wet time, rinse, fix ventilation
Growth on drywall, ceiling tile or carpet	None; removal is the fix	Porous material may have to go, per EPA
Cleaned, dried framing after a water loss	Fungistat labelled for wood	Visible mold removed, moisture corrected first
Shower curtain, canvas, cushion	Label with a fabric mildewstat	Colour test; stains are a separate job
Bathroom you want to keep clear	Label with a prevention interval	Reapply on schedule
Over about 10 sq ft, or growth that returns	Product choice is secondary	Find the moisture source
Commercial room, whole-room treatment	Professional system such as BIT	Sealed, cleaned, dry non-porous surfaces

The label check, in order:

1. Is there an EPA Reg. No.? If not, there is no registered kill claim.
2. Does the mold line name your surface? If not, it is off label.
3. Does it say kill, control or remove stains?
4. How long must the surface stay wet?
5. What is the signal word, and is a rinse required?
6. Is the moisture fixed? If not, every answer above is temporary.

Our DIY mold remediation guide covers where homeowner work ends, and how to kill black mold covers the species question.

For contractors

The antimicrobial is a small line item and a common point of challenge. EPA's commercial remediation guide gives the defensible position: removal and drying do the work, a biocide is used only where professional judgement calls for it, with ventilation, and fungicides made for outdoor use are never used indoors. Check your state’s pesticide applicator rule before a crew sprays; remediation licensing is separate, see our state mold licensing table. The full sequence is on the mold remediation process page.

What to record	Why an adjuster or auditor asks
Product name and EPA Reg. No.	Anyone can pull the label from PPLS
Label version (accepted date)	The claim must be on the version used
Surface, area, contact time held	The claim rests on both; photograph the wet surface
Why a biocide was used	EPA guidance says routine use is not recommended
Applicator license, where required	EPA notes some states require registered pesticide applicators
Moisture readings first	BIT and Vital Oxide labels put drying below 20% in the programme

Questions people actually ask

What chemical kills mold instantly?

None, on any label read for this page. Registered kill claims come with a wet contact time, and the shortest here is 60 seconds on hard non-porous surfaces for Mold Armor, EPA Reg. No. 4091-23. When EPA accepted the X-14 label in 2008 it removed ‘works instantly’ and ‘works on contact’ and accepted a 5 minute time.

What is the best product to kill mold?

The one whose label lists your surface and the result you want; EPA registration is not a ranking and we did not test products. Hypochlorite labels carry the shortest kill times on hard surfaces. Fungistat labels such as Concrobium cover cleaned wood and fabric. For drywall or carpet with growth, EPA’s answer is removal.

What kills black mold permanently?

No label promises that. Kill claims cover the growth present, prevention claims run for a printed interval such as 7 or 28 days on the Mold Armor label, and EPA says the key to mold control is moisture control. Growth returns wherever a surface stays damp, whatever was sprayed on it.

Which kills mold better, bleach or vinegar?

Of the two, only bleach products can carry a registered mold kill claim; grocery vinegar has no EPA registration. That claim is limited to the surfaces and contact time on the label, usually hard nonporous surfaces, and EPA’s commercial guidance says biocides such as chlorine bleach are not recommended as routine practice.

Is a mold spray the same as a mold killing spray?

Not always. A mold spray can be a registered kill product, a fungistat that only inhibits regrowth, or a stain remover. The directions say which: kill directions carry a contact time, mildewstat directions say apply and let dry, and stain directions say wait until stains disappear. Read the verb, then the EPA Reg. No.