lookin good mario/sue!
when i worked up at Mik MAk we used autosol to cut, and we had a finishing polish we used after to get rid of that haze after. also, a good glass cleaner will pull alot of the impurities out of the pores of the aluminum after to polish it. we never wet sanded tho, im wondering if any minerals in the water may be affecting your shine. another thing to try if you have a garage or it isnt still 30 below up there in the sault, is brake clean... spray, then wipe with a clean rag, and dont use the rag too long, it'll start smearing after a while. we used to use it to prep old fuel tanks before welding repairs
keep up the good work