Bel-Ray Foam Filter Cleaner & Degreaser is specially designed for cleaning foam air filters. The product removes oil and dirt from the filter while also preventing deterioration of the foam cells - maximizing filter life. Bel-Ray Foam Filter Cleaner & Degreaser can also be used as an engine and general purpose degreaser. For cleaning dirt, oil, grease or gummy petroleum residue from foam air filters. For cleaning grease, grime, sludge, oil and dirt on engines, machinery, tools, plastic, metal and most other materials. Will not discolor metals, paint and finishes, etc. Effective cleaner for industrial equipment and most flooring, concrete, tiles, etc. Superior cleaner - Easy removal of grease, grime and sludge on engines, transmissions and other machine parts. Harmless to electrical insulation materials.