Dave What kind of Stains do you have in your carpet? I am in the Automotive Reconditioning Buisness and I can help you out here...Carpet dying is a last ditch effort. The dye is only a temporary fix and it doesn't work as well with lite color carpeting In your case Grey is a hard color to dye...E-mail me privatly And hopefully I can help you... Steve Francis. V.I.N 10676. M/T. Portland, Maine