Sticky substance on Bighorn Aluminum Wheels

I left my tires covered for a couple years while I was sick. Now there is a sticky substance in places on them. Anyone seen this? If so what takes it off.
 

Bob&Patty

Founders of SoCal Chapter
A wild guess here. I could be from the tires and BTW, if they are Towmax get rid of them ASAP. Road tar remover might work.
 

TandT

Founding Utah Chapter Leaders-Retired
Wild guess.........maybe the covers began to deteriorate.

Or, do you have any Cottonwood trees nearby? I have found the residue from Cottonwoods can leave a sticky substance all over everything and get blown into small areas.

I would just get a good solvent free cleaner and scrub them up. Trace
 
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