
Originally Posted by
Great-Kazoo
You can use fine wet / dry on it OR call rcbs, they might replace or repair it for you no charge.
If you use a dowel, cut a slot in it from the top about 1/2' down. Put the fine grit wet dry in the slot and use it like a cylinder hone.
There are copper & lead fouling cleaners in most gun stores.
I'd still call RCBS. They somewhat slow shipping, but have always come through.
Nuclear Option :
Plan B is some hydrogen peroxide and white vinegar (used some times to clean suppressors) It's mildly caustic but will clean / remove any deposits. Well ventilated area, gloves, eye protection, and fresh water to rinse . DO NOT let it sit more than 30 - 60 sec. You can always do the process again.
with it being a small piece to clean, perhaps using cotton swabs / q-tips could be used as the applicator to the fouled area.