For nonporous surfaces like wood veneer, gauges, and clear plastic instrument panels, I recommend using your waterless wash and maintaining with D156 x-press wax. But for porous interior surfaces like plastics, vinyl, rubber, and leather..Optimum Protectant Plus is the by far the best product I use. It's impressive how good it is at filling scuffs and scratches without making the surface look "dressed". If you like the way D156 and Optimum Car Wax makes your exterior plastics look, then you would love the way OPP looks on your interior. It also has mild cleaners, which on my personally vehicle it seems to be great at removing the light dust and minimal amount of oils left on the surfaces I frequently touch. But I would still have a mild APC like Einizett 1z Blitz diluted 30:1 or Optimum Power Clean diluted 15:1. Just be sure to only uses waterless washes or quick detailers on Clear gauges