willong
Well-Known Member
Bending the wire into a small, tight J form on the end with needle nose pliers, wrapping around that J with fine steel wool, including a couple passes inside the "hook", and then crimping the wad with the pliers to keep all in place will produce a small scouring pad that one can introduce into a bottle's interior. The wire shank above the steel wool can then be bent to access the desired nooks and crannies.Sometimes dried contents will be stubborn and you can stick part of a steel wire clothes hanger (curved and bent somewhat at one end) and gently "scratch" against the inside of the bottle and loosen/remove small patches of soiling.
However, if the glass is "sick" enough, the only solution short of tumbling might have to be an acid soak with a stronger acid solution than acetic acid (vinegar).
Dave of "Digger Dave & Shovelin Shelley Beeler" YouTube channel posted an almost hour-long video on cleaning topic. He included acid soaking technique.