I've got exactly the same on my 2000 4/4.
Tried Captain Tolleys Creaping Crack Cure around the windscreen rubbers and the wiper bosses but although I think it improved things, I still have the problem.
My worry is that the fusebox is directly under the leak and I'm sure it does sometimes get dripped on.
I've sprayed some ACF 50 around it but I would like to find a permanent solution.
