I tried to clean it, but its impossbile without cutting my hands, once i found it looked strange, i tired. I have never seen anything like it. My dad and both grandfathers were glass workers, and in 50 years I never saw any glass do this. It looks like old pealing paint, but its clear glass. Even the seconds dad used to bring home, never did this. I have seen exploding glass, when they were seconds. But this, is not like that at all, I am a collector, and now I am worried about buying any pw's. how do I know the seller did not spray them with glass paint? Honestly I cant sell it like that, who would want a pw you cant touch without getting cut. This is all over it, even the polished bottom is sharp and peeling. I fear a may have to throw it away?