I bought a piece of clear window film (flex-o-glass) to cover
the dashboard of my new Murano to protect it from my dog's claws.
It was left on for several days and when I removed it it appeared the
vinyl had darkened slightly wherever there was contact. As the film
has a slightly tacky feel (it sticks to itself slightly) either there
was a transfer of the surface coating or a chemical reaction between
the two plastics. Water will not remove the stain, but I haven't tried
anything else until I hear from the "experts."
    Can anything be done to remove the stain?
    Thanks.
         Frank
    P.S. This is not the same type of plastic sheeting used in drop
cloths.