Blued receivers

[Breck Gorman]

Evaporust is a liquid soak for removing rust. Sold in car parts stores. Gently converts oxide without eating into the steel the way white vinegar does. Vinegar will eat away sharp edges on screw treads and engraving. What’s in it is proprietary. I suspect citric acid. Caution, case coloring will be removed. The end result is a dull medium grey. But it will make any rust blue, cold blue or hot blue convert to a dull medium grey without any abrasives