My bike's better than me!
Join Date: Feb 2005
Location: Northern Colorado
Bikes: (2) Moots Vamoots, (1) Cannondale T2000 tourer, (1) Diamondback Response Comp mtb
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I only care about the tube for the distance the seatpost will travel -- not all that far.
For that, I use a long, thin brush that I bought at a hardware store (maybe called a "bottle brush"?), along with some WD-40 (or degreaser or ....) and do a pretty quick plunge and scrub, followed by the same thing, but with the brush wrapped in a fairly clean rag.
If I really wanted to clean ALL the way down, I'd drill a small hole in the handle of my bottle brush, tie fishing line (or equivalent) to it, and then push IT down much farther with a dowel (or equivalent). Then, using the fishing line (or extra brake cable or....), I'd pull the sucker back up.
But I've never worried about that kind of all-the-way-down clean, personally.