I have an Eko 40 with the cleaning handle attached to the turbulators. I move the handle every time I reload the furnace. The furnace does idle a lot. I have recently noticed that it is taking a much longer time for the temperature to rise, even a few degrees. I am wondering if the heat exchange tubes may need cleaned, causing a loss of effeciency. My question is this: has anyone else cleaned the tubes by hand even though there is the "cleaning arm" attached to the side? I would assume that you would have to remove the turbulators somehow before you would be able to get a cleaning tool down there.