What safe protectant to use on dash pads....

Another vote for 303, I briefly worked as a spa tech at a hot tub store (summer job, friends' parents own the place) and they used that exclusively on all the vinyl hot tub covers. Protects against sun damage very well which is important in CO, sunlight is quite a bit harsher here due to higher elevation (physically closer to sun) and thinner atmosphere (less gases to absorb light rays).