I have a 72 colt that i have been working on.I tried the acetone,It removed the haze but it has black spots on it that is not wanting to come off.I tried wet sanding in spots to see if it would help but not much results.I may try an electric sander to see if that helps.I have 3 that i'm working on at the same time so the attex is at the bottom off the list.I got to get my stepson brandons argo ready first.