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Is there any special trick to getting pillar files clean? I have a #2 and #4, and they get super gummed up when I am using them on acrylic stems. I have been trying to be delicate in cleaning them so that I don’t damage the teeth. I’ve used a brass brush, but it doesn’t seem to be doing the trick. I would greatly appreciate any suggestions.

I use my thumb on single cut files, and generally a file card on double cut if they happen to load (rare).