Here is the care instructions for the pizza pans from American Metalcraft.
Aluminum pizza screens should be washed by hand using a mild detergent (preferably one made specifically for aluminum). After washing, pat the screen dry and store appropriately (see below). To insure proper sanitation, heat pan to cooking temperature in oven after each wash and then reapply release agent or oil to prevent sticking.
* Note: Do not expose aluminum screens to dishwashers or high alkaline / acidic detergents. Also, do not use abrasive pads as they can scratch the aluminum and create rust.
I Hope this helps!