Has anyone had any luck removing graffiti off the rocks with a wire brush? I am planning a trip to the springs on Friday and was wondering if it would be worth bringing a wire brush or two to try and work on the graffiti. I am sure the sun has really baked the paint on by now but I am not sure how soft the stone surface might be. If it is really porus maybe the brush could remove a little bit of the stone along with the paint. Does anyone have any thoughts on the subject?