I use rubbing alcohol and a microfiber cloth.
Question though: Is there any way to clean/prevent the plexi or laminate art under the dust washer from becoming discolored? I think it’s a combination of oil and the dust washer rubbing on it that blurs laminated art and makes plexi turn from clear to an opaque white.
Obviously you could wash your hands religiously (I only ever play with clean hands, but over the course of a play session your hands will get a bit oily) and maybe talc your hands. But That seems a bit overkill. Is there anything simple that one can do to prevent you from ruining your stick around the dust cover?