Don’t your ducks ever poop and then sit on it during the night? I keep the barn very clean, but still had to fill an “emergency bath” for my girls today once the temp rose to a comparatively tropical 13 degrees Fahrenheit as they were all in desperate need after days and days of sub-zero temps.
I live in Vermont. During the winter, I take advantage of the decent days (today being one of them) and encourage everyone to bathe as thoroughly as possible. Then, it’s hit or miss. I’d rather they not bathe when it is below 20 degrees or so, although wind and sunlight (or the lack thereof)...