So now I had access to the inside of the door.
You can't even see the gears and stuff that lifts and lowers the window. But you can see part of the channel that the window slides in. I wanted to start by cleaning this channel and then lubricating it.
So I got a small brush and swept it clean and then sprayed silicone lubricant on the brush and brushed that lubricant into the channel.
I did the same thing with the channel way inside the door by the hinges. I couldn't take picture of that, but I could feel my way in there and clean and lubricate that channel by feel.
I stuck my phone inside the door and took a picture of the regulator.
The grease on the regulator had died out after 18 years, so I put a glob of grease on my finger tip and felt around for the gear and then smeared it with the grease.