There have indeed been A LOT of complaints on this. I think the real challenge is that there could be many different causes for the leak (hence no single reliable fix). Most of the times, it's related to poor sealing (such as worn weather strip); then it could also be a blocked draining system or the rear window washer system. You just need to keep trying. My car had a really bad leak when I bought it. They changed the cracked weather strip and now my jack compartment is so dry it's dusty even during the rain season...
