The initial step in the G.I surface treatment is the removal of oils, dirt, and other soils that will interfere with the development of a superior quality phosphate coating, good coating adhesion, or cause surface defects. Chemical cleaning can be accomplished by subjecting a part to an aqueous spray or dip cleaner. The G.I surface cleaner chemicalwill be alkaline, acidic, neutral, solvent, or emulsion depends upon the type of surface to be treated and as per customer need.
More preferable product is alkaline cleaner, which is very effective in removing all oil contents on the metal surface. Alkaline cleaner able to convert insoluble fatty acid to soluble fatty acids and hence it is more effective than other type of cleaner