Meguiar's Heavy Duty Bug & Tar Remover (G180515, 15 oz Aerosol)

G180515 is the aerosol foaming version with an aqueous surfactant base. G107 (Gold Class) is a non-aerosol liquid with a petroleum-distillate base at 20–40% — totally different chemistry. The Gold Class formula is more aggressive on baked-on tar but carries the petroleum-solvent exposure profile; the Heavy Duty aerosol foam is gentler on chemistry but less aggressive on weathered residue. Pick the aerosol for fresh bugs and lighter tar with vertical-surface cling; pick the liquid for hardened deposits where solvent action matters more.

The DANGER signal word is driven entirely by the aerosol can itself — H222 (extremely flammable aerosol) and H229 (pressurised container), per SDS §2.1. These are physical hazards from the hydrocarbon propellant (butane + propane), not biological health hazards. The aqueous surfactant payload inside the can carries no mixture-level health H-codes. The label is honest — the chemistry is much milder than a petroleum-solvent aerosol — but the can itself is a pressurised flammable container and must be labeled accordingly.

The Amazon listing carries a Prop 65 warning. The most likely trigger is sodium nitrite (<0.25%), which appears on California's Prop 65 list as a developmental and reproductive toxin. Trace 2-butoxyethanol (<0.5%) is also a contributor. Both are below the thresholds for mixture-level CLP/GHS health classification — that's why the EU SDS doesn't list health H-codes — but Prop 65 has lower disclosure thresholds than CLP, so the California warning applies even when GHS does not.

Meguiar's markets this as 'clear coat safe' and the community broadly confirms — no widespread reports of clear coat etching, plastic-trim blanching, or rubber degradation at the labeled dwell time. The aqueous foam base is much gentler on coatings than a petroleum-distillate spray. On ceramic coatings, brief contact with labeled dwell is generally safe; on wax, the mildly alkaline surfactant (pH 9.2 per SDS §9.1) can affect a fresh wax layer in the application area, so re-wax the treated panel if needed.

Stoner Tarminator (heavy aliphatic petroleum naphtha + hydrotreated light distillate at 30–60%) is faster on weathered or baked-on tar — solvent action chemically dissolves it. The Meguiar's aerosol foam uses surfactant chemistry to loosen and rehydrate residue, which is gentler but less aggressive on hardened deposits. The trade-off is real: Tarminator clears in a single pass on bad tar but carries H332/H351/H361/Prop 65 chemistry; Meguiar's takes more dwell or repeated application on the worst cases but has no §2 mixture health hazards.