I was happy to find a tool that gets into tricky corners, molds around the bar, works great but clogs a few pipes after one round! I was at a loss for a while. how do i clean them I tried pipe cleaners, bamboo skewers, wires at hand. Everything is either too big or lacks structural integrity. I went to Lou's ISO Explorer; found that the small stiff flagwires (used for construction, landscaping, etc.) were the perfect diameter and length. You can buy a 10 pack if you can't find it elsewhere. It worked very effectively and I am delighted with the tool.