Gpm house & siding wash, gallon bottle – 880765 this house and siding wash is a fast acting, no-scrub cleaner that gets the job done. Cleans in minutes. Ideal for wood, vinyl, aluminum, stucco, or masonry. Removes dirt and stains caused by mildew and algae from painted surfaces. Designed to clean and remove discoloration caused by mildew, algae, fungus, and dirt from painted wood, masonry, stucco, aluminum, and vinyl siding in minutes without scrubbing.