Concentrated Heavy-Duty Floor Stripper, 1 Gal Bottle, 4/carton Goes on quickly with a cotton mop or scrubbing machine. Digs deep to remove stubborn finishes and heavy buildup. Ammonia-free, high-alkaline formula. Concentrated, so one gallon makes up to 45 gallons of stripping solution. Not for use on marble, natural stone or wood floors. Recommended dilution: Normal (1:5); Heavy (1:2).