Aluminum siding cleaner is made by combining household detergent with hot water. Typically, the cleaner is applied to the siding using a soft-bristled brush after wetting the surface. The cleaner is left to sit for about 15 minutes before rinsing it off with heavily sprayed water.
Generally, household cleaners are effective in cleansing dirt and chalky residue off of aluminum siding. This type of cleaner is an alternative to commercial aluminum siding cleaners. Using homemade aluminum siding cleaner is one option for restoring aluminum siding. Another is to opt for high-pressure washing, which involves blasting dirt away with water. To do this it is necessary to either hire a professional service or rent a high-pressure washing machine that can reach 1,000 pounds per square inch of water pressure. While professionals have access to machines capable of spraying water with up to 2,800 psi, machines rented to homeowners are usually less powerful.
Experts recommend pressure cleaning aluminum siding at least twice a year to maintain its appearance. Some homes with dirty aluminum siding develop a chalky appearance, the result of years of cleaning neglect. Chalking is the result of normal oxidation of the original paint and is not something that is preventable.