LOCTITE® SF 137DA (known as PRO STRENGTH VARNISH REMOVER) is a clear, aromatic ketone blend of solvents in a super spray aerosol specifically formulated to dissolve and clean the residue deposited on carburetors and chokes during the normal operation of gasoline engine powered equipment. Typical applications include carburetors, manual and automatic chokes, linkages, heat risers and PCV valves.