Fresh air intake plenum leaks

You can always lay under the dash with someone running a water hose into the cowl, and just make sure you wear a snorkel and goggles. This spot has a tendency to get pinholes real bad. My car had been outside since day one and across the US multiple times. The lip inside the cowl to keep the water out of the fresh air vents was all but gone on the passenger side. I have found the best way to clean the cowl is to open the fresh air vents, roll down all the windows, hop on the freeway, floor it and keep my mouth shut as the krap flies. Must look interesting from behind.