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I've always thought it was oils out of a person's hand that were absorbed over years of use then later got released with some soaking in the sun. Maybe I'm wrong but I haven't seen any other plastics do this-most plastics usually dry up not expell oily gunk like on the steering wheels. Also not all the sport wheels do this-I've seen many that have weathered just fine with no residue. I have two stored in my basement right now- one is fine and the other one has the sticky gunk described. I agree a thorough understanding of what the stuff is would steer us in the right direction for removing it.
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