There resides on the inside edge of that stripping a thin layer of a felt type substance. repeated cleaning with harsh chemicals (ammonia?) will result in the bond of this layer and the rubber to break down, eventually causing the loss of felt, allowing the window glass to come in contact with the raw rubber, and as we all know...raw rubber and glass stick pretty well. how's that for a runon sentance? LOL...Since there are lots of ways to get a layer of felt on the inside of that strip again, yet none of them really cost effective, i recommend that you get on the horn with St.Charles Isuzu and have Joe Isuzu ship you some weatherstrips PRONTO <img border="0" alt="[Hillbilly]" title="" src="graemlins/notooth.gif" />