When coated aluminum furniture is exposed to the outdoor elements, oxidization occurs. Oxidation is a type of corrosion that actually can protect the surface of the furniture, but it destroys the appearance. Left untreated, oxidation can cause pitting in the metal, and no amount of cleaning can repair it. Clean off the oxidation when it appears to extend the life of your furniture.
Clean the dirt from your aluminum furniture, using mild soap, water and a sponge. Let the furniture dry.
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Mix 1 quart of white vinegar with 1 quart of water in a bucket. Use the sponge to rub away any light oxidation from the surface of your aluminum-coated furniture.
Apply a quarter-size amount of fine-cut automotive rubbing compound designed for use on aluminum onto a terry cloth rag. Rub the compound in a circular motion over areas with medium oxidation. Let the compound dry, then wipe it from the surface of the furniture, using a clean terry cloth towel or microfiber cloth.
Add dishwashing soap to a bucket of water. Use super-fine steel wool dipped in the soapy water to clean areas of heavy oxidation.
Rinse the furniture with clean water once the oxidation is removed.