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I wonder if filling these spaces with something like "Great Stuff" would keep all the crap out, or is this the same as the sound deadening foam that traps condensation??
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I tried that years ago but it just got waterlogged. Try removing
that stuff from nooks and crannies.
The best thing is to leave the sheet metal stock and undercoat it. As long as it can dry out from time to time, your car won't rust. Garaging is the best if you can. It's also possible to improve /add to the stock plastic fender liners so less crap gets in behind.
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In the meantime I do know that some nooks and crannys can be blasted out with a pressure washer
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I have been warned not to use a pressure washer because it forces water into places it shouldn't go. That said, If you're careful and don't aim it at, say, the fuel injectors, it's still better than leaving the gunk in.
Anyone have a favourite DIY undercoating?