Sea Foam Deep Creep is an excellent option for this type of application.

J~

“P.S. If you do not receive this, of course it must have been miscarried;
therefore I beg you to write and let me know.” - Sir Boyle Roche, M.P.


Bob: I expect the experts will want make & model - and maybe a photo before
providing detailed info. I would start by cleaning the exposed portion of a
reciprocating drill with a brass brush, tooth brush, rags and WD40 or something
similar, repeating as long as it seems worthwhile. That's all I've ever really
had to do.