I pulled off the wipers and that grill in front of the windshield. It very rusty in there around the wiper motor but looks like its not rusted thru so if I can remove the rust and paint I can save that area. I was thinking to power wash and sand blast but then I got to wondering where would all that water go? So before I fill up some area with water and grungy stuff can someone tell me, will it flow thru to below firewall and out? It must flow thru since those louvers would have let water in on a heavy rain.