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Fender has not used an actual cloth material for Grill's on their amps since the very early 50's. It is a plastic weave. You can also take the baffle off, the speakers and spray it with a cleaner(like Simple Green), hose it off, let it dry and you'll have a new looking grill..
I would order new grill cloth and plan to replace it. I would order the cloth and it would sit around for about ten years and then i would pull it out after I sold the amp.