303 Products 303 Tire and Rubber Cleaner

Spray onto a wet tire sidewall, agitate with a stiff tire brush, and rinse off — the foaming alkanolamine + glycol ether formula lifts brown bloom and silicone dressing residue effectively, especially on light to moderate buildup. Community photo evidence on r/AutoDetailing and Amazon verified reviews supports single-application bloom removal in most cases; heavily oxidized tires may need a second pass. The chemistry is meaningfully milder than caustic Bleche-Wite-class alternatives — pH 10 vs. pH 12–13.5 — which trades a small amount of single-application aggressiveness for noticeably better tire safety and lower PPE burden.

Buy it if you want a tire cleaner you can use weekly without worrying about drying out your sidewalls or wearing chemical-resistant gloves every time. The mild-irritant WARNING-level chemistry is the big differentiator — eye and skin PPE are recommended but not required. Skip it if you have heavy neglected bloom that needs a single-application strip — for that, the caustic-class cleaners are more effective at the cost of safety; come back to 303 once the heavy bloom is cleared and use it for routine maintenance.

The formula is mildly alkaline (pH 10) with a glycol ether co-solvent (diethylene glycol monobutyl ether) and an alkanolamine builder (ethanolamine), plus a trace skin sensitizer (ethyl acrylate) and a vanillin fragrance. The SDS classifies it as a mild skin and eye irritant with a WARNING signal word — eye protection during application and nitrile gloves for the brush step are appropriate but the chemistry isn't corrosive. Environmental footprint is moderate: water-based with no petroleum solvents and minimal VOC; the brand markets a biodegradability claim but the SDS does not specifically state OECD 301 substantiation, so the score reflects the unverified claim conservatively. No Prop 65 warning. Rinses through any normal storm drain without elevated pH concerns.