Leaking window

[pugcrew]

I have traced a water leak to the rear side window on my tourer.

I would prefer to remove the rubber seal and refit with or without some extra sealant. I also think I have read somewhere that there are some clips under the seal which tend to leak which I may seal as well.

Has anyone done anything like this before or at least got any ideas on how I might go about this?

I have read that some people have used Captain Tollys Creeping Crack Seal which would be my Plan B if I can't do this but from what I can see from the outside I suspect that the gap I have got is going to be too large for it to work.