Cleaning Aluminum
Use mild a detergent and warm water when possible.
Alkalis, even baking soda, and especially stronger alkalis
discolor aluminum. If trying a stronger cleaner, pre-test
on a hidden place to be sure it cleans satisfactorily and
does not damage the aluminum. Always follow directions on
the product label for aluminum, EXACTLY.
Be cautious about using abrasive cleaners (scouring
powders, steel wool, abrasive polishes, etc.) as they may
permanently scratch aluminum; painted or anodized aluminum
surfaces will be permanently damaged. Do not clean
aluminum when it is too hot to touch, or if temperatures
go below 50 F.
On outdoor surfaces, remove bugs, sap, tree seeds,
etc. as soon as possible, as they harden with exposure to
sunlight and heat, and so are harder to get off. Suitable
solvents will remove tar and similar substances. Test
solvent first if the aluminum is painted to be sure it
doesn't also remove the paint. Follow label precautions
when using solvents--no spark or flame in the area and
have sufficient ventilation.