I have a 25 ft Python that I have had for over 15 years . Still works great , it has just gotten grungy inside to the point where it looks black instead of clear . I can take the vacuum part off and brush clean that part of the hose , but I don't have a 25 ft bottle brush..lol . Anyone cleaned their's and if so how ? I thought of putting some marbles or bb's in it with some water and just run them back and forth . I clean old bottles I have dug up that way .