I just got done checking mine and I noticed after years of playing with a strap on, I have discoloration around the end hole, probably caused by sweat and never cleaned properly. This isn't my main unit, rather it is my beater that I also let friends use, or who ever shows up so over the years it has seen a lot of action. I tried several kinds of cleaner, but nothing will touch the discoloration. I wonder if there is any kind of bleach especially made for removing stains in that area.
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