Originally Posted by
JohnDThompson
I use a wire brush mounted in a drill to clean things like that. Quick & easy. Don't worry about a steel brush damaging threads in a steel shell -- not gonna happen!
+1!
I do this on every frame when servicing the BB, some frames really need it, but once those shells are cleaned with a wire brush, they
shine and the threads work like they should.
Only trick is to find a 1-1/2" wire brush (a nice snug fit in the shell), they are scarce where 2" are common.