Over time , grime collects under top and on top of drum. I thought if I could lift the top I could clean it out well. Is there an easy way to do this? Perhaps I should not lift the top foe fear of damaging something inside. I cannot find my users manual. Any info would be a great help. A reference to an on-line manual would also be appreciated. Many thanks. Gary e-mail: gloughead@eastlink.ca