Best product/products for cleaning aluminum trailers

I have a new WILSON trailer that i have only had for a couple of months and noticed it is already starting to get that oxidized look to it .So what do you guys use to best combat this problem and keep them shiney?

You need to find a big truck wash and have them use citrus on it . No acid though , that will turn your finish dull and you won't be very happy ! Citrus is what we use on the bull racks to keep there shine .

NO ACID , NO ACID , NO ACID ! I can't stress that enough , I've seen a guy ruin the finish on a year old merrit spread axle and let me tell ya the owner wasn't very happy !

There is actually a big sticker on the trailer that says no ACID,so i was wondering what could be purchased in small quantities to clean it.

I would still stop into a big truck wash and ask them exactly what kind of citrus they are using , these new bull racks are pushing $80,000 so I know the more reputable washes are using some high quality citrus . Blue Beacon washes are all over the country , they would be the first I would ask exactly what brand it is .