Radiator Specialty Gunk, L104, 4 OZ, The Liquid Wrench L104 Number 1 Penetrating Oil is able to free frozen bolts, nuts and locks. The Liquid Wrench L104 dissolves rust and cuts through grease and is able to eat through corrosion with ease. Guaranteed safe on all metals, the Liquid Wrench L104 Penetrating Oil is a must have for your shop. Features: Frees parts frozen by rust, corrosion, scale, paint, varnish, carbon, or gumUse on garden hose nozzles, clamps, pipes and frozen mechanismsPowerful blend of quick-acting, fast penetrating solvents Safe for use on painted surfaces Low odor, Low VOC.