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Depending on what you're cleaning and the nature of the pipe (is it smooth or does it contain sharp bends?) you could consider pigging.
That is what we use on big hydraulic systems where the lines can be hundreds of metres long.
- Flushing
- Pigging
- Flushing again
All this while bypassing all aggregates like motors, pumps and pistons.
I used to work in a brewery and we used hot caustic followed by acid for cleaning most things but some pneumatic (spent) grain systems got pigged in freezing weather to avoid the wet grain freezing into a plug.
If you can angle the tube and open both ends, would a weighted string attached to a brush work? If you're worried about it getting stuck inside due to blockage, attach two weighted strings to it but only send one through and let the other hang out from the end you stick the brush through.
If you have access to both ends, maybe cotton balls and a shop-vac?