Holy Hell I never want to do that again. If I ever encounter another window so messed with by a previous owner im just going to buy a new door, glass, and channel.
So at some point before my ownership something happened to the passenger side door glass. Either it was removed and replaced or it got broken and replaced. Two of the 6 retaining tabs for the fixed glass were broken off already. But the bad part is how the window was secured. It was sealed with a mix of windshield urethane (correct) but also a thick bead of gooey sealant. That combination gave me hell trying to clean it all up.
After a few hours I finally got the door cleaned up, then did the fixed glass. That was easy by comparison. Much better angles.
Finally I cleaned up the aluminum channel that separates the fixed glass from the drop glass. This is what prompted all of my work on these parts. It popped loose when I was removing the scratched drop glass. Then I saw it didn't have the rubber seal around it like my drivers door does. I really like the finished appearance of it, so I decided to remove everything and clean it up and put it back together right. I'll tell you though, the cost of a new channel is worth it compared to cleaning urethane out of it.
Well at least that's all done and tomorrow I can get the fixed window all assembled.