Each to their own i suppose,however after forking out for a very expensive fresh paint job on my cooper im picky as to what ends up on it.
Fair enough mines out side being eaten by the salt off the roads as not had chance to wash it this week and the hose pipe has frozen so the hour in the morning tomoro that i pland on washing it wont be fun.
In a dilute amount its fine for me it is any way, i use brake cleaner to take brake fluid off painted areas all time when its been spilt at work and so on never huts any car yet as long as you give it a good wipe off i only use unipart 5 liter tins in a pump sprayer never tryed other brands maby some of that cheap car plan stuff out on the job.