I recently purchased the pink Breast Cancer special edition littman stethoscope. I just started a job and am on classroom orientation, so I havent even used my new stethoscope yet. It was thrown in the bottom of my bag, and when I took it out last night, I noticed black markings all over the tubing of it. It looks like the black ink markings you get from newspapers (except thats not the cause). I guess its from the bottom of my bag, Im not exactly sure. Anyway, I've tried everything to clean it - alcohol wipes, nailpolish remover, Tide to go - and nothing has worked! I need help! I was very excited to get it and now I'm very disappointed. I dont know how to get these markings off! Please help!!