Hey, thought of something from way back...not exactly Autopian, but anyhow...
I wasn`t gonna deal with every vehicle in my family, and other family members were gonna just abuse them and run `em through a carwash anyhow. So I came up with an idea that did work fairly well:
I got a Carwash Package at the best local tunnel of death after talking with the guy who supervised the line, explaining what I had in mind, and making sure he was on-board.
I took a QD (today I`d use a RW that leaves LSP-stuff behind) and had the carwash drying crew spritz it on before they did the wipedown. With one vehicle, I had `em us my towels (this was back pre-MF). I tipped the crew, which they really appreciated, and told them that others would be bringing them through in the future, expecting the same treatment and providing the same tip. They did so, at least when they remembered, and it was better than not doing anything.