I remember when my sister got married (decades ago) and my brother stopping the groom's friends from spray painting Just Married on the car cause he was part of Andy Granatelli's race team and knew the paint would destroy the finish on her new car.  

In the good old days we'd use white shoe polish on the back glass, where it would wash off. Although some people used shaving cream.

Shaving cream was a favorite!  Chalk was favored for a while.

Shaving cream, shoe polish, and chalk sure bring back memories.

Lol!