All you need to do is clean the area you have been playing the call , same on cleaning the striker tip, i NEVER use sandpaper on the tip of my strikers, just clean the end up with a few twist of it on a small piece of scotch brite , you could possibly ruin the tip of a striker by sandpapering the tip in my opinions, good strikers from good striker builders will play forever with just a few light pressure twists on a piece of scotch brite all your doing is cleaning the tip.