MS TopFoam Reset Acid is a highly concentrated cleaning agent used in knockdown programs to remove historical contamination. Historical contamination accumulates due to the use of poor-quality cleaning products in regular cleaning programs. MS TopFoam Reset Acid reduces inorganic Category 3 contamination to manageable levels for a fresh start to an effective cleaning program with MS TopFoam Power or MS TopFoam LC Fresh. The product is not suitable for continuous use. This product does not foam.