Nu-Calgon - CalClean is a formulation of liquid detergents, containing a perfect balance of surfactants, grease solvents, alkaline cleaners, corrosion inhibitors and water conditioners. It is a concentrated detergent designed to be diluted with four to ten parts of water; best results are obtained when applied with one of the Nu-Calgon sprayers. Greasy dirt and dust in the air can collect on air-conditioning and refrigeration heat exchange units. If these finned heating or cooling coils are left unclean, heat exchange is cut down, compressors have to work much harder, costs go up and often valuable equipment breaks down when it is needed most. In addition, clogged and dirty permanent filters cut down air flow and do not filter air, allowing dirt to contaminate rooms and stain walls around air ducts. Regular cleaning with CalClean protects equipment and helps it to operate to peak efficiency.