What happens if car wash soap dries overnight on a car? with grass mixed in......?

my friend recently pulled a prank on my car, and im wanting to do something ridiculous that will pay him back without damaging his vehicle.





so i was thinking about dumping car wash soap all over it then dumping bags of grass clippings on it, then overnight it should dry up right??





would this damage it??What happens if car wash soap dries overnight on a car? with grass mixed in......?
yes, it could damage the finishWhat happens if car wash soap dries overnight on a car? with grass mixed in......?
it would make tons of marks if u do it wrongly. but if ur friend cant figure it out in the next morning u have to tell him.
Soap left to dry will damage the paint finish.
It shouldn't do anything more than hurt your friendship.