Just like with every high performance ball, cleaning after each use is a must since Coverstock is so soft and porous. Every high performance solid ball will do this if proper maintenance isn't used, not saying that's the case in your part, but from what I've seen or experienced, if you don't clean after every set, that will happen. Look at the Widow when it first came out and everyone was saying the same thing and you have others saying it still hooks the same as it was new.