Earlier quoted context omitted.
Could I have damaged the cars even though I saw no signs of damage? It would be nice if someone else with knowledge would chime in here. If this damages cars, then I want to know, so I can stop doing it in the future.
Unless the cars are perfectly washed and clayed, even running a clean finger over a car is likely to introduce scratches. I just wouldn’t ever touch someone’s car. You can look up people even trying to detail their cars to make them cleaner and end up leaving “love marks.” It doesn’t matter how soft the thing you’re using is. It’s because the car has contaminants on it and by rubbing anything on the car, those contam…
I don't even know what a 5 stage detail means but I can safely say you are overreacting. A car is just a tool and a rando putting a fridge magnet or leaning against your car once in a while is just completely negligible compared to the amount of shit a paint is exposed to when driving it. Sand and dirt do not ask for your permission either.