Spiney, I don't fully understand. The rear windows on my 1990 are in really good shape. Although I think this things rarely been driven with the top up. I also rarely leave it, even overnite in the garage with the top down.

I would suggest putting the top up on a warm day to let the plastic warm gently and stretch back out.

I would also recommend some type of conditioner. I found one I like, I'm at work now, it's at home. I've only used it a few times. Did a great job cleaning, and removing some minor scratches from the prior owners.

Although after using it to clean the interior of the windows, I might need to set up an appointment.

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KLK, MCSE

1990 500SL

I was always taught to respect my elders.
I don't have to respect too many people anymore.