EASILY REMOVES BAKED-ON SHELF PRIMER (KILN WASH) FROM THE BOTTOM OF FUSED PRODUCTS, LIKE BLACK GLASS, HOT COLORS AND OPALESCENT GLASS. APPLY WITHOUT DILUTION TO THE BAKED-ON PRIMER AND THEN LIGHTLY SCRUB WITH PLASTIC SCOURING PAD.  THIS SHOULD REMOVE EVEN THE MORE STUBBORNLY ADHERED PRIMER.