I believe a Swiss team guided by a local are responsable!https://twitter.com/#!/stevehoneyman
Maybe he needs to show them how to clean up after themselves too.
I find it strange that you spout that you and your team were challenging kids for littering and were cleaning after others yet you can't clean after yourself
I must be doing something wrong, I usually put chalk on my hands http://www.ukclimbing.com/images/dbpage.html?id=185106