Burra- They receive heat every night with the heat lamps. With all due respect, this is my third flock of over 20 ducklings. I know that a jumpstart on oils is all they need to be more hardy. I simply can't believe there isn't a product or innovative solution out there.
Nicole - A few ducks should stay relatively sanitary with a clean water bowl to dunk their heads in. The main thing with ducklings is that they have water deep enough to clean their nostrils out. I've never allowed it to get that bad, but I hear they can become pretty ill if their nostrils can't be cleaned. I always use bathtub time with mine because the more a duck is exposed to water, the more they are putting their developing oil glands into practice. Also, it is really therapeutic for them as they are pretty cramped in their night time containers. In my experience, getting them outside in a rabbit tractor and swimming in the tub helps keep them from nipping each other and tearing out feathers. The longer it takes to be fully feathered and oiled, the longer it takes to go outside and be free and out of my hair for the most part. Then it's on to egg laying and meat making!