Are they really cleaning up the chalk with a bucket of soap and water and using a brush and cleaning up their sites before they leave? NO
Many do not even clean up after their dogs and throw their trash in the fire pit for the next person to clean up.
Use coloring books and crayons.
A lot of people do not want to pull into a site with this mess all over it.
Like the previous posted said, it gets tracked into the RV and you can't get it out.
Chalk up your own driveway at home.
People are so rude and inconsiderate of the next person who occupies the site.