Ok,
Having just moved house, I now have a unused quarry about 10 minutes walk away from my new house which has a couple of bolted routes in it. The routes to my knowledge are never used but I would like to boulder about in the quarry but the rock is dirty and overgrown. So apart from getting rid of the creepers and other plant life whats the best sort of brush for cleaning the dust and dirt off rock without damaging the rock?
Cheers...