I have a wonderful old AMF jig.

Parts of it where it adjusts for forward/reverse pitches appear to me to be brass.  True?

The numbers are starting to lose clarity due to age?  oxidation?  any suggested cleaning process that won't remove the notches and numbers?  The lateral pitch settings which appear to be in the silver colored portion of the jig are very clear.

Thanks, ball drilling gurus!

REgards,

Luckylefty