u/Additional_Tank2661

Hello i just had my first and also a botched batch of mead (i left it in primary fermentation for like 8 months bc i forgot abt it lol) and now the glass fermenters have a visible residue from the krausen or whatever around the shoulder of the glass, even after cleaning, and I cannot clean it off as the mouth of the fermenters is too narrow. Are these reusable or are they toast? Tips?