You might want to see if you can get new tubing instead of a whole new stethoscope. I have a knit sleeve on my stethoscope, too. I got it for the same reason. I wash it by bunching it between my hands and a bar of soap or liquid soap. Rinse it thoroughly, dry by squeezing in a towel, then straighten it out and hang it over something over night.
I agree it's the skin oil that causes the problems. I often get sweaty @ work, I try to take my stethoscope off most of the time-unless I'm actually using it. I hate stuff around my neck anyway.
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