im a newbie to this but im not soft i am well aware that brasso is not a substitue for lubricant, and will be thoroughly polished off before being reassembledJust remember to get all the brasso off again before you put it back togehter.
Grinding paste and solenoid do not make a good combination.
Hmm now that I think about it, the potential for breaking things vastly outweighs any potential improvement. No matter how badly dye finish their guns internally.