Water Leak in Cabin!

the coat hanger method works well....I filled my cowl area with water (not enough to go over the lip that leads to the vent) and then just wiggled the wire around in the drain holes. I did this several times until stuff stopped coming out.
Replacing the wiper seals is also a good idea. I had my son spray down the car with the hose while I stayed in the car with my head under the dash until I tracked down the leaks