Clay Bar

A clay bar is a bar of tacky plastic clay, similar to Blu-Tac, which is rubbed over the car's paintwork after thorough washing, but prior to machine polishing. It will remove any contaminant on the paint such as rail dust or soot which can electrochemically bond to the paint.

Clay bars come in several grades, from very soft which are designed for enthusiasts to clean their paint during their regular wash process, to heavy duty which are designed for removing heavy amounts of industrial fallout.