Originally Posted by keith
I would avoid any more agressive methods that might remove any remaining case colors along with dirt and rust. I'm not 100% certain, but I believe that a mild acid like vinegar would also degrade any remaining case colors, so I would avoid any acids (or caustic solutions) until I was satisfied that there were no case colors present that might be unintentionally removed.

I agree.

May God bless America and those who defend her.