Cool, learn something new every day.The abrasive is probably aluminum oxide crystals. It’s a pretty common material in abrasives since it’s relatively cheap and safe for both users and the environment. I would guess you could get the wheels with other abrasives, too.
I’ll try my Purple Power on my old one and see how it goesI use these from Harbor Freight on the burners, flavorizers, grates. You can also clean your brush by just soaking it in simple green over night. The other ones ware out too easily. Also I clean all the parts with Simple Green and heavy duty steel wool before using the grinder on them.
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