Was at home depot today and came by a dryer vent brush (in the heating/plumbing section), looked like it would make a nice stem cleaner (at least for wider gauge egyptians, not modern) so I picked it up, tried it out and it is, a tighter fit than your normal stem brush, but it did it's job, cleaned my km and generic in the process
. Feels more solid than a regular brush.
Anyways the brush is 24" and I paid around 5 bucks for it with tax, this is how it looks like (made by Deflect-o, part # dvbrush/6):
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