I
Bought a very long brush and that cleans it very well. What's the type of tubbing your usingI run a canister on my fresh setup. I prefer the smooth tubes due to detritus buildup. You can clean them with effort. Pull them off, place in the sink with hot running water. Then bend the tubes, and push the bend up the length of the hose. This will loosen the stuck on stuff. Rinse it under the hot tap. Did any of that make sense? I could try and video what I mean if not.