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When they get in water, is the water still rolling off? It is the time of year for molting. You should see loose feathers in their area.
Thank you! Does it seem like wet feather to you?If it is wet feather, take a warm cloth and clean the preening gland. I did this for a couple of days two times a day.This has done the trick for me. If really dirty, you can try some soap - but only on the preening gland, not the whole duck. But, when they have wet feather you have to remove all swimming water and make it so that drinking water is only available. Once the preening gland is clean the feathers will be coated with oil again and you can reintroduce swim water. This can take days to weeks depending on their condition. Their feathers will not improve as much until a molt.
It's happened to a muscovy duck of mine, and they love to play in mud. Generally it's due to a clogged preening gland from dirt and mud, so the technique above will work.
https://www.fresheggsdaily.blog/2016/02/treating-and-preventing-wet-feather-in.html