twittering noise

Strange chirping, twittering, tickling, clicking sounds from air getting sucked through a small amount of water.
The sound of blebs? Dunno the right word.

Baby milk flasks got warm from dishwashing.
They stand upsidedown on their openings and cool.
The air that cools contracts and builds up an under-inflation inside the bootle. At the rim it is standing on air sucks into the flask through the wet puddle of dishwashings water.

Mildly noisecleaned as it had to be recorded in high gain.