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When they don't bathe often, they don't clean off or groom. If they are dirty, the feathers get rumpled and loose the waterproofing. If they dont' groom often, then they aren't spreading the oil through their feathers.

Muscovies in general have less waterproofing than mallards. Most likely what you're seeing, however, is the old feathers. After a bird moults, it stays 'pretty' looking for a while, but if it's been a while since they've moulted, they'll look a bit grungy. Since the feathers are old, they may...