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Re: Drain pipe cover
The foam is to stop rattle, but it also adds stored water casing rust.
The crud from the pipe will store in the inner wing, wash it out regularly.
However, remove the rubber pipe ends as they are the cause of the problem.
Normally (on other cars) the drains come out through pillar and sill, with a ducks beak type valve, but these are just a very crude flap.