Photos:
The top black trim piece has to be removed. First time around I took one side piece off and had to replace the clips as they broke. This time I did it without taking the side off, just lifted the side piece clear at the top to unhook the top trim. The damp on the window is largely caused by my soggy golden retriever !
I used my new clip pliers to carefully locate the trim clip and pop them (or break them) to allow the trim to come off. Better to break the clip than the trim as the clips are slid in and can be replaced.
The metal bracket behind the trim was rusty and the seals were soaked. First job was to take this off (5 screws) and clean, dry and zinc coat.
That should make it last a bit longer.
These are the replacement clips for the top trim, you need 5.
Refit the metal bracket and run 2 beads of silicone, one along the bottom as shown and one........
along the top. I used black mastic on the first car but this is easier. Mastic is fine until you want to pull the trim off again to realign it and then it generates huge 'threads' of black goo that drip everywhere !
I added another thin bead to the seal on the top trim before refitting it.
You need to flex the trim to get it to sit under the side trim and locate the lugs on the side trim into the ends of the top trim. Then look underneath, make sure the new trim clips are over the holes in the bracket and give it a gentle thump back into place.
Job done.