what to use on the dash?
Simple green on interior elements! It is an industrial strength degreaser, so I don't know what kind of effects you will see on vinyl over time. I think even Viper and I can agree on this one, no? My feeling is that it will dry out the vinyl perhaps. I dunno.
Viper - when you run out of simple green, they seem to be making a foam wheel cleaner. Might be worth a try.


