My "Plastic Truck" door panels squeak! They are in fine shape but when I'm driving down the road and my left leg rests against the panel, they squeak. It's the sound of plastic type noise. I find it most annoying and would like to know if there is a "fix". The cup holder makes the same kind of noise but it is only when I open or close it. Note: Plastic rubbing on plastic makes a different sound than metal on metal. Would it help to spray silicone spray on the places where the joints meet? I'd hate to do that and then learn that the spray will cause the plastic to deterioate.