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I used a bolt, nut, washers and tape to make a drill adapter so I can spin the (uninstalled) tubes with a battery drill. Then wrap a kitchen scouring pad around the tube and slowly slide it along the tube length while spinning with the drill. Two passes with the scourer, one pass with a solvent soaked rag and a final pass with a little lithium grease on a rag.
The above process will smooth off the rough/high spots and give a brushed metal appearance. I wouldn’t recommend sanding as you want to leave as much galvanised coating on the tube as possible. Also, just enough grease to coat the surface but not encourage dust to stick to the tubes.