I've never cleaned out the brushes in a window motor, but here's a post that shows how to take apart the KK's driver's door and get to it. This post has good pictures and it helped me when I took my door apart to fix my side view mirror.
http://www.jeepforum.com/forum/f292/how ... y-1210699/
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2008 Liberty Sport 4x4 Automatic
Jeepin By Al 4" Lift Kit
BFG KO2’s 245/75R16
Full MOPAR skid plates
Rock Lizard Skink Super Sliders
AtTheHelm Front Recovery System & Roof RackM116A3 Trailer build thread: viewtopic.php?f=72&t=77997