Best Of

I use a stainless steel brush from Harbor Freight. It works REAL well on tubes that do not have a guide pin {6sn7}. I just hold the tube and move the brush back and forth and circular in nature. I then spread some red deoxit on a toothbrush and do the same on the pins set aside to let dry/evaporate some so none is running off the pins into the electronics below. Honestly I do not use so much that it would, I rather be safe.
Those that do have guide pins I use a 3M green scrub cut to a size that works easily to get between the pins and guide pin. I've even used a piece of 800-1500 or higher wet/dry sandpaper then blow off. Personally I've not found anything that cleans the socket well for 9 pin tubes. All the super small brushes I've found were too large, definitely don't want to make those bigger, or break them. I just work a firm toothbrush on the sockets best I can get it in.