How to Clean & Sharpen Files?

The best I have found to remove pinning is a copper pipe flatted in the vise. Put a handle on the opposite open end of the pipe and go at it. As the copper wears away it leaves the impression of the file teeth. The more you run it across the file the more it takes on the shape of the teeth. It works wonders. The copper breaks down into a fine dust. Nothing left behind to clog up the file. Other than that I use Krud Cutter to remove rust. Leave in over night making sure the files do not sit above the level of liquid or they turn black. If you prefer them black like I do my impact sockets then trust me when I say it leaves a very durable flat black finish.
 
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