Stains and gunk won't stay caked on your house with this Mold and Mildew Stains Pressure Washer Concentrate. This tough pressure washer soap will penetrate, lift away dirt, and give your surfaces the ultimate refresh and restoration they deserve. Use this concentrate with our Direct from Concentrate Soap System so you can get to cleaning messes right away, no mixing required*. Concentrate can also be mixed with water for up to 4 gal. of solution with gas or electric pressure washers that include an integrated detergent tank.