Rain-X 2-in-1 Glass Cleaner + Rain Repellent

Yes — confirmed from the SDS dated February 17, 2025. Section 3 of the safety data sheet discloses only deionized water (80–100%) and acetone (3–7%); no ammonium hydroxide and no ammonia are listed. Rain-X also labels the product 'Ammonia Free' on the Amazon listing. Safe for the adhesive layer in aftermarket window tint and the bond layer in hydrophobic glass coatings on that basis.

The mixture is classified as a flammable liquid (Category 3) because of the acetone co-solvent — flash point 28 °C (82 °F). The flame pictogram and the WARNING signal word are about fire and vapor safety before the product evaporates, not a health hazard. The safety data sheet lists no health hazard codes for the mixture (no eye, skin, respiratory, or sensitization classifications).

No — and this is independent of the ammonia question. The product deposits its own silicone-based water-repellent layer with every application, which will overlay any existing ceramic glass coating or factory hydrophobic treatment and interfere with the bonded layer's beading behavior over time. Use a dedicated ammonia-free glass cleaner without a water-repellent additive (Adam's Glass Cleaner, Stoner Invisible Glass, Chemical Guys Signature Series) on coated glass.

The current safety data sheet (Feb 17, 2025, version 3) explicitly states in Section 15: 'This product does not contain any Proposition 65 chemicals.' The Amazon flag does not match. We follow the SDS as the dispositive source for the current formulation — the Amazon flag may be a legacy listing artifact from an older formula or a marketplace-default setting the seller has not refreshed. If a future SDS revision adds a Prop 65 listing, or if the back-of-bottle photo on Amazon shows a Prop 65 warning, we will revisit.

It cleans adequately on lightly contaminated windshields but is not a category-leading glass cleaner — community comparisons on Reddit r/AutoDetailing place it below dedicated cleaners (Stoner Invisible Glass, Adam's Glass Cleaner) on heavy interior outgassing film. The rain-repellent function is weaker and shorter-lived than the standalone Rain-X Original Glass Water Repellent (yellow bottle), which is purpose-built for beading durability. The 2-in-1 is a convenience product — fewer steps, lower durability on both jobs.

Section 8 calls for tight-sealing safety goggles and impervious gloves as boilerplate spray-application precautions, but Section 2 does not classify the mixture for eye or skin irritation. The chemistry basis for the goggle call is splash and flammability during spray dispensing, not an eye-irritation hazard. Real-world risk for normal pump-spray glass cleaning is low — eye protection situational, gloves not required by the SDS chemistry.