Acetone is widely available from any number of car paint suppliers and I’ve never yet been asked for my details.
Don’t expect the law to be enforced consistently! I’ve got away with parking on a double yellow line, doesn’t mean it’s OK, or those who copy my happy go lucky experience won’t get a ticket!
A card payment collects the necessary details, so no need for questions. Or if the shop know you. A stranger paying cash is more suspicious…
Dave