If I use anything on the rails it's a green scotch brite pad and its only 3 or 4 light strokes. If i do this at all, its once, no more that twice in an entire year on a heavily used call.
I do not use any emery cloth, drywall screen, or sandpaper on the rails. You do not want to be removing any wood from the rail, which is more likely to occur with more abrasive materials. If you are removing material you are shortening the rail and how the lid rides it, which can change the tune, and will change the tune if done frequent enough.
I will once in a great while use a fine grit sandpaper on the bottom of the lid to raise the grain back up on a heavily used call. I use little to no pressure when sanding with the length of the lid, so I don't change the radius of the lid or put flat spots in it.
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