When I stripped my 240z down, I took the cowl off, removed the wiper bag and cleaned all of that area out. I used a snake-thing and got far back in there to the drain holes and made sure they were free of junk. I removed a handful of leaves and crap out of one. Then I used POR-15 and painted it all in that area. I then sprayed a paintable rocker-guard coating in there and it stuck to the POR nicely.
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