Once the tank gets low(on E) put the heater outside and let the remaining fuel burn completely out. This will burn off the residue build up on the wick and make it easier to turn off manually. do this often. i also use an old toothbrush to "fluff up" the wick. if the residue is too hard for the toothbrush bristles, flip the toothbrush over and break up the residue with the back side of the toothbrush. once all (or nearly all) of the residue has burned off you may see some smoke when you ignite the wick again. also, it may smell for a bit. I always light and shut off the heater outdoors. I mounted a dolly (table withe 4 wheels) under the heater to make transporting it easier. hope this helps!