I actually never had any issue with a Yinhe rubber at all and have used about a hundred of them. But sure there can be quality issues in some of all rubbers sent out. Strange that it would happen to two rubbers on the same blade. I think it might be something else that's been causing this. I always use Revolution No 3 cleaner and a soft cleaning sponge. I used tap water before, and that worked almost as good. Never any problem.