I used Finish Line bike chain lube that I had on hand. Sprays on wet then sets up dry, resists dirt and water.
I took the first door card off, started to peel the plastic off and it was super messy black goo everywhere. I was not looking forward to tearing all the tracks out, so I looked down from the top and there was just a little dark spooge at the top of the rails but the guides were really squeaky so I figured they were mostly just dry so I cleaned off the spooge with a flat blade screwdriver and then shot some of the chain lube down each rail, cycled the window a couple times, shot a little more in and that was it, worked like a champ! Put the door card back on, did the other side the same. Very happy with the results! I will let you all know when it ceases to work well again.