What you need:
Ball bearing, filter wool and strong magnet. I use about 5mm diameter ball bearing. Ball bearing size can be different depending on you lily pipe inner diameter. I got the strong magnet from broken 3.5" hard drive.
Slice the filter wool. I cannot use the whole wool because it is too thick, cannot fit the tube.
Wrap the ball bearing with filter wool
Tie it and cut away the excess and that about it.
Test run, cleaning curve section of lily pipe
and cleaning straight section of lily pipe