Heyer!

MY ‘sanctuary’ was defiled a while ago by a bunch of punks with spray cans, and this place was absolutely beautiful, running creek, ducks, boulders, plantlife, you name it. Now it’s an eyesore when you walk past and I’m noticing parents and kids aren’t visiting there anymore.

How do I clean this horrid stuff off my beloved rock? (I say ‘my’ because I’m arrogant and greedy, hehe) If I use something like turps, I’m afraid of making a smudge which will permanently stain the rock. Any suggestions, especially from anyone from anyone in conservation groups?