Re: hwo to soften up
What makes them stiff is the evaporation of the plasticizer. PVC in its basic state is very hard (PVC pipe). The plasticizer makes it flexible. The evaporation of plasticizer from a vinyl dash board is the film that forms on the inside of your windshield in your car. PVC (vinyl) plasticizer is not generally petroleum based like vasoline. Armorall is a plasticizer specific for vinyl. So if you took the windows off and soaked them in Armorall, it might soften them (I've never had a need to try this, so I'm only speculating it would work).