Quote Originally Posted by INLAND44 View Post
The harsher solvents can bleach the patina out of Parkerizing by removing the old oil and linseed oilicon stains. They will not harm any metal parts.
Indeed, while cleaning around the heavily gunked rear sight, I found that a relatively mild cleaner (Hoppes Elite) slightly bleached the Parkerizing. I've used the Elite cleaner on dozens of guns, and I've never seen that happen before. Thanks!