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I've noticed that my Littmann stethoscope has become quite sticky over time. It doesn't seem to have the same smooth feel it once did, and it's starting to affect my ability to use it effectively. Could you please advise me on how to make it less sticky? I've tried wiping it down with a cloth, but it doesn't seem to make much difference. Is there a special cleaning solution or technique that I should be using? I really value my stethoscope and want to keep it in good condition for as long as possible.
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