I'm having trouble keeping some black dust or dirt off my round bits(orb and ball). Does anyone know how to avoid or mitigate this issue?

honestly, keeping a damp paper towel handy

I just use a microfiber smaller towel. It works great! Got a 4 pack at Walmart for 3.99.

I don't think there's any way to keep them off permanently but a good wiping with a wet cloth and some soap should work great. Cleaning frequently can also help, just figure out how frequently you want to clean based on how much you play!

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