Old alum intake cleaning??

I painted my intake on my dart, i'm getting lazy.I use purple power on my Mustangs natural cobra intake,then use 1500psi pressure washer to rinse it off.Brightens/cleans it right up.Might have to scrub real bad spots with a tooth brush in the really bad spots.Always cover electrical parts.I use it instead of engine cleaner on blocks n stuff. Don't delute it,also add it to laundry when washing my work clothes.