One product commonly used to remove paint overspray from roofs is a mild solvent or paint stripper specifically formulated for the type of paint used. However, it's important to note that the specific product to use may depend on the type of roof material, as some solvents or strippers can damage certain surfaces. It is recommended to consult with a professional or the manufacturer of the roofing material to determine the appropriate product and method for removing paint overspray without causing any damage.