>>The barber shop I go to has a "trim a beard" on the list of prices (on the wall). Although I have never seen anybody having it done.
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>I'll do it all the time, I hate cleaning up the washroom sink so

Against that, I regularly sacrifice a plastic bag, which I cut at the seams almost to the bottom, and spread it over the sink. The little that's fallen over the bag is easy to clean up (and no, I'm not saying "that's the part of me which refuses to go away").