PRO 4000 is a super concentrated cleaner and degreaser ,PRO 4000 is a super concentrated, safe, water soluble cleaner and degreaser and, as such, has been awarded the certificate of: The Institute of Chemical Manufacturers and Distributors. PRO 4000 is very economical in use, diluting with up to 20 parts of water and the formulation also includes a rust inhibitor. Degreasing and cleaning equipment and machinery. Degreasing and cleaning floors and walls. Removing sludge from lathers, milling and grinding machines, etc. Removing grease and scum from heating, ventilating and air filtering systems. Removing soap scum from shower stalls. Cleaning equipment in sewage and water plants. Cleaning traffic signs, etc. Degreasing and cleaning vehicle engines. Cleaning vinyl coverings. Cleaning down prior to re-painting - simply apply and wipe off - no rinsing required.