long, thin, flexible brush (Britannia)

Needed to clean narrow tubing ... now that it's yard-work season, I dug out my old CamelBak water pouch – and discovered that the hose has acquired some disgusting gunk on the inside.

Rather than try to buy a new one, I thought I'd have a go at cleaning it – but the aperture for the tube is tiny, barely 2 mm across (you can barely squash a Q-tip into it).

I managed to squirt alcohol inside with a syringe, but it needs a good scrub with a flexible brush – about 2 mm wide and 30" or so long.

Before I try to buy one, does anybody have such a thing ... that they could even just lend me, to do the job?!

Thanks for your time,
Antonia.
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