I just bought a small U-cleaner on ebay. I’m not thrilled with it
so far. I tried plain water (they recommended) not good.
I’m trying rubbing alcohol now. Much better but still junk stuck
on the escape wheel gear from my size 12 Waltham. A small paint brush
got it off but left lots of lint on it. It’s not quite what I expected.
Yerigh-Nov 17 has it right.