I have a rugged white wall used by mi nieces to draw using Crayola Chalks to prove otherwise. I don't have a power washer but I did tried washing it using a hos

I have a rugged white wall used by mi nieces to draw using Crayola Chalks to prove otherwise. I don't have a power washer but I did tried washing it using a hose with an attachment. Then scrubbing it with soap and in faded considerably but didn't went away completely. Still why will someone have to pay/do the work to clean up the mess that this guy was doing (for six months, 13 times!), just because it's a "political message" it's ok to make a mess and have other people clean it up?