Was looking for products or ways to clean the aluminum hull of a Bass Tracker. Im trying to remove the stains from where it has been sitting a while without damaging the aluminum. Thanks.

Here's one product.

http://www.auroramarine.com/aurora/catalog/aluminum-boats/alumabrite-01240.htm

Google, "aluminum boat cleaner" , and take your pick.  

I've never used an aluminum cleaner, so I cannot provide a consumer report, pro or con.