I have polished a lot of aluminum like exterior trim, valve covers, water pumps, A/C components, wheels and more. I have found a lot of good products work but the common thread is hard work and patience especially if the pieces are oxidized badly. If you don't have anything to work with now I suggest calling Eastwood and letting them suggest some stuff. I have attached the engine compartment of my Firehawk. The bright work was done with products from Eastwood.