I clean every day but I do have sand in the run and coop and when I had plastic up for winter there was a lot of dust build up. So when she started the sneezing I opened it up and hosed everything down to really clean it. Maybe I’ll switch the coop from sand to something less dusty. But it’s so...
Did you ever figure this out? I have a chicken doing the same, but is fine otherwise. She is definitely wheezing but eyes and nose are clear, she’s active and eating. The others have no symptoms at all.