DeoxIT on tube pins

I use Magic Eraser. Stick the pins into a pad and work them in and out - quick and easy way to get the whole circumference of the pins.

Some basic contact cleaner that quickly evaporates without residue (unlike DeOxit) should be safe. I’d spray it on the Magic Eraser pad and then dip the pins. Note that you don’t need a near-mirror finish on the pins like you find with new-production tubes. Just clean them until they no longer appear dull. The further abrasion from installation in the tube sockets will make for a very sufficient contact.