CarCareTruth Score
Mediocre, but wear gloves and ventilate.
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Prices may varyThe manufacturer's Safety Data Sheet classifies this product with one or more GHS Category 1 health hazards — the most severe tier. The hazard statements in quotes below are the verbatim GHS language from the SDS, as required by OSHA's Hazard Communication Standard. The line under each statement translates the GHS classification into plain language.
GHS Category 2 acute dermal toxicity — classified as toxic in contact with skin.
If on skin:
Call Poison Control immediately at 1-800-222-1222 (US, 24/7, free) and have the product container with you. Poison Control's standing guidance is to not induce vomiting after chemical exposure; they will direct first-aid steps based on the specific product.
About this product's hazards. This product's Safety Data Sheet uses signal word DANGER.Read the manufacturer's SDS and follow all safety instructions before use. CarCareTruth ratings translate the manufacturer's safety sheet. They do not replace the SDS or substitute for a hazard assessment specific to your task.
Health score is for adult use as intended, per the manufacturer's SDS. It does not model child ingestion, accidental spill cleanup, or off-label use. See the safety panel below for full hazard classification, and /disclaimer for the full editorial scope.
GHS hazard codes are quoted from the manufacturer’s Safety Data Sheet. PPE tiers below translate those codes and the listed ingredient chemistry; they are not CarCareTruth recommendations.
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Translated from the manufacturer’s Safety Data Sheet, Section 8
H370 (specific organ toxicity · optic nerve damage, Cat 1) is the SDS basis for eye protection. SDS §8 specifies chemical goggles or safety glasses. GHS08 (health hazard pictogram) corroborates. Pour-fill is the primary splash exposure point.
CarCareTruth publishes the cited sources verbatim and does not advise what action a user should take. Consult the full SDS before use.
Translated from the manufacturer’s Safety Data Sheet, Section 2
H311 (toxic in contact with skin, dermal Cat 3) is the SDS §2 basis for skin protection. SDS §8 specifies gloves. GHS06 pictogram is present. Skin contact during reservoir top-off is the primary exposure scenario.
U.S. regulatory standard
29 CFR 1910.138(a); 1910.132(d)
“appropriate hand protection when employees' hands are exposed to hazards such as those from skin absorption of harmful substances.”
OSHA standards apply to workplaces. Cited here as the U.S. reference threshold for the underlying hazard class.
CarCareTruth publishes the cited sources verbatim and does not advise what action a user should take. Consult the full SDS before use.
Especially relevant: in enclosed space · prolonged use
Translated from the manufacturer’s Safety Data Sheet, Section 2
H332 (harmful if inhaled, Cat 4) is the SDS §2 inhalation classification. GHS06 (skull and crossbones) raises the floor to recommended per W17. SDS §8 states respiratory protection is needed in case of inadequate ventilation. Outdoor pour-fill is low risk; recommended for enclosed spaces or prolonged use.
U.S. regulatory standard
29 CFR 1910.134; 1910.138; 1910.1000
“the primary objective shall be to prevent atmospheric contamination… When effective engineering controls are not feasible… appropriate respirators shall be used.”
OSHA standards apply to workplaces. Cited here as the U.S. reference threshold for the underlying hazard class.
CarCareTruth publishes the cited sources verbatim and does not advise what action a user should take. Consult the full SDS before use.
No PPE specified in published sources for ventilation. Absence does not imply “not needed” — consult the full Safety Data Sheet.
PPE tiers translate the manufacturer’s SDS and U.S. regulatory standards. Not professional safety advice. How we report safety.
Scope of these PPE tiers. The tiers on this page translate the product's Safety Data Sheet where one is published, plus its ingredient chemistry, into a comparable rating. They describe a formulation, not a situation: a tier is not a safety determination for any specific user, task, quantity, or environment. The manufacturer's label and use instructions govern how the product is handled. Where the product is used at work, the employer's PPE program and hazard assessment under 29 CFR 1910.132 decide what protection is selected, not this page.
No warranties. CarCareTruth makes no warranties, express or implied, and expressly disclaims the implied warranties of merchantability and fitness for a particular purpose.
This product ranks #17 of 19 in Washer Fluid.Three above it ↓
Last reviewed June 14, 2026
TL;DR Rated to -20°F with strong, broadly trusted cleaning performance from owners. Health score is 1.0/10: this is a DANGER-class methanol formula. Methanol-free alternatives score significantly higher on health and are worth considering for households with children or pets.
PEAK's PWN0H3 is a ready-to-use blue all-season formula rated to -20°F, confirmed by SDS freeze-point data. It handles winter road salt and grime at a commodity price point, no dilution needed, in a standard gallon jug. It's well-reviewed by owners, with cleaning and streak-free performance consistent with the label claims. Available in the PEAK lineup at multiple temperature ratings; the -20°F version covers most US cold-weather driving without deep-freeze protection.
Best fit for cold-climate daily drivers in most of the US who want reliable -20°F protection at a commodity price. Not for households with chemistry concerns; the DANGER-class formula carries real handling hazards. Not for sale in California, Texas, or Maricopa County, AZ.
SDS carries DANGER: H302 (harmful if swallowed), H311 (toxic in contact with skin), H332 (harmful if inhaled), and H370 (optic nerve damage). Proposition 65 applies; methanol is listed as a developmental toxicant. SDS §8 specifies safety glasses and gloves; pour-fill outdoors is the primary exposure point. Drain-destined via stormwater runoff; no aquatic H-codes in SDS §12.
The product label and ASIN title state -20°F protection. SDS Section 9 confirms a freeze point of -28.9°C (-20°F). This is a solid mid-tier freeze rating for cold-weather US driving · adequate for most of the continental US but not for extreme northern climates that see temperatures below -20°F regularly.
Yes. SDS §3 (Old World Industries, 01/11/2018) lists methanol (CAS 67-56-1) at up to 33% by weight as the primary active ingredient. Methanol is the standard chemistry for a winter de-icer washer fluid at this temperature rating. The DANGER signal word and Proposition 65 warning both stem from the methanol content.
Not for purchase as a consumer product in California due to CARB VOC regulations that restrict methanol-based consumer products. The product carries a Proposition 65 warning for methanol as a developmental toxicant. California residents should look for a methanol-free or ethanol-based washer fluid with CARB compliance.
Methanol ingestion requires immediate medical attention. The SDS classifies this product as H302 (harmful if swallowed) and H370 (specific organ toxicity · optic nerve damage). Contact Poison Control (1-800-222-1222 in the US) or emergency services. Do not induce vomiting. Keep out of reach of children and pets.
No. The PWN0H3 is a ready-to-use (RTU) formula · no dilution is needed. PEAK offers separate concentrate products in their lineup. The PWN0H3 is designed to pour directly into the washer reservoir as-shipped.
The listing for PEAK PWN0H3 -20°F DE-ICER Windshield Washer Fluid carries a California Prop 65 warning. PEAK PWN0H3 -20°F DE-ICER Windshield Washer Fluid is a working automotive fluid rather than a passive part, so the warning points at the formulation itself. The manufacturer's Safety Data Sheet is the primary source for what is in it: the hazard classification and the PPE tiers on this page are translated from that sheet, and the full SDS is linked from the safety panel. California requires the warning whenever exposure to any of roughly 900 listed substances is possible. It does not name which substance applies to a given product, and it states no dose or risk level, so it is not on its own a measure of how hazardous this fluid is in normal use.
Marketing copy from PEAK, via Amazon. Not editorial.
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