If you were the last person at risdon boulder, you know who you are shame on you. I'm happy however to accept an ignorance plea,
so im going to offer some education free of charge. here in tasmania we use brushes to remove our tick marks, if the tick marks are as long as you arm, like some of them were at risdon could i suggest a really big brush, alternatively do small tick marks and give me all the chalk your saving and desperate to use up. if your poor feel free to let me know id happily donate a brush to your poor arse cause, as would many more should they be made aware of your plight.
many thanks in advance for your improvement in behaviour.