The gloss finishes certainly look to me to be sprayed two part urethanes, meaning catalyzed urethanes. If so, they are exceptionally tough coating and far and away tougher than varnish of the highest quality. The cloths you use are most likely a bigger consideration than the actual cleaning product but a very weak solution of dawn dishwashing detergent, and I mean weak, together with a two cloth microfiber application should work well. you don't want anything that leaves a greasy film behind, you just want it absent of any surface film and then let the science behind the urethane do its job of showing its gloss. quality varnish work seems to be maintained quite well with Scotts liquid gold as its silicone free and just evaporates over time. headliner material will wash nicely with Spray Nine, again with the two cloth method.