I agree, I think you should consult an avian veterinarian.
My duck had arthritis and pain in her legs. Your duck could have pain from a different reason, but some things may still apply. My vet had her on pain medication that is only available by prescription, and a very high amount as well. We also had her on very soft surfaces, which it looks like you are doing. We restricted her movement as well, so no long walks even if she wanted to. I carried her a lot.
The pain medication helped her feel well enough to preen some. My duck didn't preen well, had very poor feather quality, and stayed wet for days after becoming wet. My vet recommended that I put my duck in clean water regularly when it wasn't cold. And that I towel her off afterward and then allow her to preen. They didn't recommend I use soap.
My understanding is that dish soap is reserved for situations where birds have been exposed to deplorable environments. You may be washing off any beneficial waterproofing oils your duck has with soap. I don't think I would do it unless your vet advises you to.
My duck had arthritis and pain in her legs. Your duck could have pain from a different reason, but some things may still apply. My vet had her on pain medication that is only available by prescription, and a very high amount as well. We also had her on very soft surfaces, which it looks like you are doing. We restricted her movement as well, so no long walks even if she wanted to. I carried her a lot.
The pain medication helped her feel well enough to preen some. My duck didn't preen well, had very poor feather quality, and stayed wet for days after becoming wet. My vet recommended that I put my duck in clean water regularly when it wasn't cold. And that I towel her off afterward and then allow her to preen. They didn't recommend I use soap.
My understanding is that dish soap is reserved for situations where birds have been exposed to deplorable environments. You may be washing off any beneficial waterproofing oils your duck has with soap. I don't think I would do it unless your vet advises you to.