a typical wash cycle lasts for 8–15 minutes depending on the type of garments and degree of soiling. during the first three minutes, solvent-soluble soils dissolve into the perchloroethylene and loose, insoluble soil comes off. it takes approximately ten to twelve minutes after the loose soil has come off to remove the ground-in insoluble soil from garments. machines using hydrocarbon solvents require a wash cycle of at least 25 minutes because of the much slower rate of solvation of solvent-soluble soils. a dry-cleaning surfactant "soap" may also be added.