Woodcraft sells the Norton version of Scotchbrite in 4 grades - Green (coarse), Maroon (medium), Gray(fine) & White (extra fine).
My local Woodcraft sells an assortment of 2 each for about $12.
NAPA Auto also carries one brand, or the other in their paint aisle.
The green is pretty gnarley, the white can remove rust from a gun, without damaging the bluing (used with oil, of course). I think that the maroon or gray would be best for cleaning aluminum - they both are grat for "brushing" stainless.
Again, the white is similar to 0000 steel wool - will remove light rust from chrome- followed by a polishing agent.