Gallon, Contractors Solvent.  Removes what others can't...even silicone!  Now you can remove the toughest messes lighting fast- works in seconds!  Removes tile and carpet adhesive, roof tar, caulk, sap, expanding foam and much more.  100% organic.  No chlorinated solvents.  100% active ingredients, contains no water.  Great for large jobs or refills.  Biodegrades in 8 days.