Anti graffiti paint is cleverer than the average graffiti artist. But what a pollaver. So many resources going into a solution to remove artistic vandalism or is it freedom of expression?. Whatever stripe it is, it's a lick of paint and under law it is usually all treated as one - a crime - and has to go.
Prevention beats cure. When the artist moves in, the invisible anti graffiti coating makes sure paint can't stick permanently. And when you clean off the graffiti the coating also comes away easily.
One of many outstanding anti graffiti products can also prevent rain penetrating stone.