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.