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DittoDupont KRYTOX grease would be best and longest lasting for this , its a flouropolymer grease and completely inert and wont attack plastic / rubber , GPL 206 is a good grade for this , expensive however.
I tried that method too, I ran across an adjustment bulletin for the vista roof and read all panels should be level with the roof. My front (moveable) panel was not level, it was about 1/2 inch lower in the front. I loosened up the bolt one side at a time behind that accordion piece and leveled the glass out. Bingo, no more noise. I had a popping noise sounded like it was comin from passenger b Pilar. When roof was open no noise...now it’s quite open or closed.Here it is!
I pulled the flap back and revealed this nub here. I slathered it with some silicone paste and marine grease.
The little thing that travels the track needs the grease. I do know if you open and close the window repeatedly after greasing the grease may eventually wear out and need reapplication.
It's kind of sloppy I should wipe it up and redo it neater next time.
I feel like the marine grease works better since with the silicone paste it still makes the tap noise occasionally but is still 90% better. When I dabbed a little marine grease on it but not enough it seemed to be better.
Either way way better than the tapping that doesn't stop.
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Dupont KRYTOX grease would be best and longest lasting for this , its a flouropolymer grease and completely inert and wont attack plastic / rubber , GPL 206 is a good grade for this , expensive however.