Chemical Guys CLAY_BLOCK Clay Block V2 (4.6 in. x 3.5 in. x 1.7 in.) Easily removes rail dust, water spots, tar, bugs, and paint overspray from automotive paint and glass surfaces Will not strip or remove wax or sealant protection No harsh abrasives that scratch Easy to grip design 1 bar will do 15 to 25 full size vehicles