they make aftermarket stick-on rear window defroster grids. I put one in my cutlass years ago...didn't do the best install, but it works for the most part....would be better if I was more careful installing it. I think i ordered it through jc whitney, and it sounds like exactly the thing for this if you can get access to the backside of that glass.
and cavaliers60, he said he was only going for 50-60 degrees....no worries about the plastic melting when it has to withstand at least twice that on the hottest summer days
