Never have cleaned them- the car was pretty clean when I got it (less so now!). Rich Boschert in my local club (PCNC) verified that the polyurethane won't stand up to heat.
WHY it's getting so hot, I have no idea, though I did notice it after a 150-mile drive with some stop-n-go on the way back. Baked polyurethane, anyone?
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