1. How do you clean the pipes once the old hose is removed? I guess the surface of the pipe is not totally smooth any more: dried residues might have built up, it may even be somewhat corroded (?)
2. What if the surface of the pipe is not smooth, would you use any sealant between the pipe and the new hose?
3. Do you put anything between the new hose and the clamp? Under some of my clamps there is a plastic `textile` sheet, wrapping around the hose so the clamp does not directly touch the hose.
4. Any other tips and tricks are highly welcome!