Here are my thoughts on pot call conditioning. Do NOT rub back and forth with whatever abrasive you prefer. What happens is, when you rub in the first direction, you are cutting material out of the surface, but when you rub back the other direction, you are pushing a lot of what you just cut back into the grooves. You then have to rub more and more which shortens the life of the call. Rub in one direction, pick up the abrasive and move it back to iriganl starting position and rub in same direction. Then either blow the dust off or rub it on your pants.