Professional strength. Citrus based. 100% Organic. Biodegradable. No harsh solvents. Non-corrosive. Safe on skin & hair. Safe on hard surfaces, cured paint, metal, and wood! Amazing Contractors' Solution removes all this: adhesives, asphalt, blacktop, fresh blood, grimy wash tub build-up, carbon black, caulk, protective compounds, floor adhesive, fresh liquid foam, fresh wood glue, grease, grime, fresh liquid insulation, cable jelly, lacquer, lubricants, mastics, oil, fresh oil-based paint, resins & rosins, tree sap, water seal, silicone sealant, diesel soot, fresh oil-based stains, duct tape, tar (road & roofing) and more!