Anyone know what substance the hand car washers use to clean alloy wheels?
I can spend hours trying to get my alloys clean and they always still appear
grubby yet if I take the car into one of the numerous hand wash places that
have sprung up, they spray the alloys, leave for a few seconds and then
spray with a power washer and they come up good as new.

Also any recommendations for cleaning tar off the car?

Cheers

Steven.