Does anybody know where the leak is from? I'm assuming its the seals but it could come from the spoiler as well? Another member pointed it out as well.

 

could be. You can try something to find out where the leak is, but you need another person. You hop in the trunk with a flash light while someone sprays the car with water really good. look for drips simple.

 

Its probably leaking from the tail lights. Ive had 3 preludes, and on all of them, had to pull the lights and re seal them.
Pull the trunk liner off, and check to see if water is leaking down inside the trunk from the lights...

 

mine was from the rear sunroof drainage pipes. they got clogged, backed up into the trunk. mine is on a 4th gen btw.

 

where do these drains supposed to drain out, and whats a good way to get them cleaned out?

 

I had this problem in my 4th and now my 5th. It was the drain tubes in the 4th but still trying to figure out what it is on the 5th since that's not it. Both had/have water in the same spot, right corner of the trunk.

The tubes are supposed to drain out the rear fenderwell. When you peel back the carpet in the trunk, look directly to the side and you should see a tube on each side. I just put a Shop Vac to mine with a custom tube attachment I made and sucked the stuff out in my 4th. Still trying to find the problem in the 5th.

 

Taillight seals.

 

i'm going to try out the tubes(if I can locate them) and the tail lights.I know my tail lights are fogged up a bit. I'll post if i can find the problem