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Using a rasp on knots that have sap still in them, need to be cleaned with a 'file card' every so often. A file card is a little paddle with very short brush bristles on one side, and a "back bent" set of wire bristles on the other side.

If the teeth of the rasp become clogged with cuttings, you apply more pressure, and skid off the loaded teeth into the softer wood, making gouges that are hard to smooth out. It is way easier to just take a few (4-6)strokes of the rasp, then stop and clean the teeth with the file card, inspect your work, and continue.

Rasps are also sized, just like files. Start with a coarse rasp, on down to a fine rasp, then a coarse file (if need be),to fine, using a file card no matter what instument you're using. I've found that using the brush side of a file card will work very well on sandpaper too! Unclogs it amazingly well.
 
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