It is found that aluminum alloy doors and windows have been oxidized and rusted, and the rust can be brushed off with a fiber brush dipped in clean water.

Do not use steel grit, sandpaper, steel balls, etc. For polishing. After the rust on the surface of aluminum alloy doors and windows is removed, the exposed aluminum element will react with oxygen in the air to form a new protective film. Using sandpaper and steel balls will destroy the original aluminum oxide protective film, lead to a new oxidation reaction of aluminum alloy, make the frame of aluminum alloy doors and windows thinner and thinner, and finally affect the service life of aluminum alloy doors and windows.