Originally Posted by eye.surgeon
Modern dash materials won't crack....
Not true. As a former interior repair guy, I saw it all the time. Mostly because of what people put on it. Anything greasy, such as Armor All, will dry the plastic and eventually make it crack. Mostly ok Dodge trucks, but I've seen it on almost every make. Mild soap and water is the only thing to use.
By the way, if you do get a dash mat make sure you get the dingle berries and fringe to hang from the ceiling and fuzzy dice from the dash.