View How To Restore Corroded Aluminum Shower Door Pics. The bottom frame that holds the pivot door and the glass insert next to it, is corroded on the external side. It is a silver type material, not sure if it's aluminum or what.
Using a powertool and j.flints. If the aluminum or brass frame you are about to paint is heavily corroded take time to restore the corrosion or the paint will not stick well. Also, if there are areas with mold and mildew, reapply the cleaners and scrub more as needed.
Oxidation of steel garage doors results in rust which if not checked leads to corrosion and disintegration of the steel garage door.
But only the bottom piece is corroded and disgusting looking. The white powder is the aluminium oxidising and the 'dents' are the symptoms of corrosion. Then use a baking soda paste and scrub with a stiff bristle brush. Baking soda is a great way to destroy mildew, calcium build up, and grime on your aluminum shower doors and window frames.