What's the best way to clean vacuum tube pins?

How about cleaning the holes the pins go into?
I thought about using a 1 inch pipecleaner in an electric drill.
Any other thoughts?

Instead of steel wool use scotch-brite.

Dweeler, I bought something from Audio Advisor called socket savers. 2 cool little nylon brushes that work perfectly for cleaning 6922 tube sockets and larger things like xlr sockets and power tubes....I've used them for several years now...

Well, after all of the cleaning, what kind of sonic differences did you notice?

dip them in cleaning acid. You can get it at hardware store. Be careful of course.... Dip pin only in a small glass container / small glass bowl or pyrex (only about 1/8 to 1/4 depth of acid) for about 30 seconds and then neutralize in baking soda solution (water and baking soda in another glass bowl for minute or so. Wash tube with joy and water if possible. Will remove any chemicals bonded when tube was made. no need to sand and works better. Acid is cheap, couple bucks for small amount. obviously only small pin tubes - works great on NOS nine pinners.