How do I clean kung fu (wing chun) sash

I have recently started wing chun, and I didnt wear my belt whilst training. My Trainers that were in my bag have put a tiny amount of dirt onto my sash and I was wondering how to clean and if im allowed to clean the sash?

Thank you.

Asked Feb 27, 2015

TIP: If it's not your answer to this question, please click "Leave a Comment" button under the question to communicate with the question owner.