Try the brass brush, but try a hard toothbrush first... with the proper solvent a toothbrush may be all you need. The aerosol type of brake cleaner is very rough on paints and may remove the paint without any kind of brush.
Don't use any kind of solvent with the grips installed. They should not get oil soaked or experience any kind of chemical distress... remember they are over 60 years old if they are original WW2 grips, and should be considered fragile.
The '70s Mauser grips should also be handled with care to make sure they DO last for 60 plus years.
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regards, -John S
"...We hold these truths to be self-evident that ALL men are created EQUAL and are endowed by their Creator with certain UNALIENABLE rights, and among these are life, LIBERTY, and the pursuit of happiness..."
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