The first BIG thing is to not polish your blades, as Goater said. But, Kydex can put scratches on a blade polished or not. The best way I've found to avoid that is to assemble the sheath using Chicago screws instead of grommets. That way it's easy to take the sheath apart and clean it after you've finished grinding on it. Nothing else seems to be able to totally remove all the grit from inside the sheath....
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