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Yesterday I tried using leftover paper towel tubes and stapled paper towels around the top. You can make the tube longer by using two tubes, folding the 2nd and putting it halfway into the 1st one and stapling them together! Continue wrapping up with a layer of towels. Spray the towels with disinfectant! Then you can make it fit in between by flattening the tubes and scrubbing in an up and down motion to clean this area, this is easy and requires no expensive gadget. When you are done, remove the used dirty paper towels. Save the tubes for later cleaning! Frugal and easy!