Is car wash soap safe for ceramic coatings?

Only if it's pH-neutral and free of gloss-enhancer or wax additives that can mask the coating's hydrophobic behavior. Soaps explicitly marketed as ceramic-safe (HydroSuds, Cerakote High Foam, Turtle Wax Hybrid Pure Wash, 3D Pink) are the safer bets. Avoid wash-and-wax hybrids on a coated car — even if they don't 'damage' the coating, they can dull the beading that makes the coating visible.