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Cleaning recommendations?
(i.imgur.com)
In the spirit of making Trees a welcoming and uplifting place for everyone, please follow our Commandments.
91% isopropyl alcohol and a course salt. Block the holes and give it a shake (check surroundings before shaking). You can also save that alcohol and use it again next time.
Pro tip, you can also add a couple of drops of lemon juice to your water to make things less likely to stick to the glass.