I use a strop that is well over 100 years old, used by my grandfather in his shoe shop. It has never been cleaned and works perfectly. It has never had metal polish or any foreign material rubbed into it. Grandpa always used the strop only to remove the burr that formed during the sharpening process. If the blade still needed any work, he stayed on the stone. He could get a knife sharper than ANY other person I have ever known. This includes blades done on many of the really popular sharpening systems. Unfortunately, knife sharpening is not skill passed down genetically.