I would check the MC seal mentioned above and all other firewall boots/grommets/seals in the area first. With a little luck, any places that could leak will be readily visible. If not, you may have to spray water on different spots on the firewall and have a helper look for leaks on the inside (at this point, a little more water won't hurt).
If it's not a firewall seal, I'd look for a leak at the bottom of the windshield.
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