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I asked this same question when I was first handed an alcohol swab. It makes sense though to clean the earpiece. It doesn’t sit inside the ear like most earpieces, but there are people prone to ear infections and there are also people with really gross ears.
Cleaning off the headsets doesn’t leave many smudges or traces of dirt on average, but the outliers are gross. It’s better to be safe than sorry for sure. Even just using an alcohol swab before wearing it can give you a good peace of mind.