I soaked it in a vinegar and water solution then rinsed well and let air dry. I never had much luck with using the CPAP to blow the hose dry.
I had a long dowel that I would push a rag through sometimes but I was always afraid it would get stuck. If I were paying out of pocket, I'd make a hose brush. Duct tape a wad of cloth to the end of a dowel. Or drop a heavy string through them pull a well tied cloth through it.
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