Salt Off Protector is specifically formulated to quickly and effectively remove salt deposits from metal, fiberglass, plastic, or painted surfaces. It contains special PTEF polymers that bond to the treated surface to help prevent the formation of future deposits. Depending on the application, Salt Off can be sprayed directly onto the surface to be treated and then rinsed with fresh water, or simply left in place. Formula is safe for use on all boats, vehicles, trailers, marine parts, engines, fishing gear, and more. It will not etch, stain, or otherwise damage metal or plastic surfaces. Salt Off is also very effective at protecting marine engines used in saltwater; when used with the Salt Off Applicator, it will flush deposits from the engine's cooling system to help ensure maximum performance and service life. Will not etch or stain surfaces being treated Helps flush deposits from engine's cooling system | Salt Off Protector, 22 oz