Quote: Yes, it can...more likely to happen if there's poop tho.
Don't think wetting would make it easier, someone to hold him while you part the feathers all over the body to see skin is the way to go.
Hard to do alone, more hands the better, cover his head/eyes with a towel can really help calm them down.
Odor is not coming from his beak/nostrils is it? Certain respiratory illness has a distinctive odor there from what I've read.
Hope you feel better soon! It will be good for the boys to be self-sufficient for a few days, they will appreciate you even more. Stay well hydrated, even if you don't feel like drinking water. Tea with lemon and honey would be good, too.