just stripped my tunnel on my srx 700, polished it with steel wool, and finished it with mothers aluminum polish. it shined like a mirror for a day then lost its gleam. I have heard of polishes that keep the shine, anyone know of any???
truck tool box polish from Lowes, I like to apply it to my tunnel after mothers, and then I finish with a coat of mothers carnuba, lasts half to all of the season as long as I just rinse off the dirt with warm water, no soap.
If it is really badly scratched not you need a polish first. Maybe some of those real fine grit aluminum polish bars. I can't remember the color you will need but white comes to mind.
I don't polish my tunnel cause it's black but I did spend a good afternoon polishing a 2"x2"x.125 aluminum bar I was going to use on my boat and 1"x1" aluminum "L" trim piece I put on my boat this past summer and got it looking like a mirror. The Flitz and Mothers polishes just made a mess. The clay polish bar cut in real good and even took out the scratches. I tried it all and that is what worked for me the best.