I'm getting water leakage in the trunk from somewhere. Last year, the right rear tail light seal was the culprit so I put some Prestone Power Steering Stop Leak fluid on it to rejuvenate it (as I did with my sunroof seal) and it fixed the problem. I also did the same with the trunk seal, took it off, cleaned it, cleaned leaves out of the recessed area and put it back on.

This year I'm getting water in again, the left tail light is not leaking and I can't find the source of the leak. Short of me getting in the trunk while someone hoses it down (which it might come to), a friend of mine noted that the rubber trunk stops were toast. Maybe that's affecting the spot where the trunk is stopping, making it go too low (since there's no rubber there for it to hit, it just hits the metal protrusions the rubber is supposed to be on) or something, I don't know.

Any suggestions?

1991 300d 210k