I work with a company that supplies a hell of a lot of car washes in UK, pretty much every single one in Essex, Kent, London and surrounding counties and they also ship a lot to other suppliers who sell it on. I.e they all pretty much use the same stuff.
NONE of the workers will ever let it go on their car paintwork. Give it enough time and it will wreck it. It WILL wreck chrome trim and alloys in no time.
Bloody good TFR for engine bays though.