Well my mate just got a new car, got paint protection, was told not to use cleaner, just water then chamois off.
Needless to say, 2 months later, the car looks absolutely terrible, paint is stuffed, marks and swirls all over it.
Dont listen to stupid car sales people, i think its just another way to get more money out of u. Make sure u clean a car the proper way.
Dirt isnt gonna lift off without some soap agent. Its basic physics