I always throw mine out. they will have a coating of 'stuff' on the outside, not someting I want to store and reuse!
Right now is an exceptional time, and without a face mask, I would postpone coop cleaning until I could buy some. Throw some more shavings out there, have ventilation, and move on to something else.
For
@Momplus1 , maybe another workup? I'd want more answers, myself. My asthma is allergy related, and finding out what my triggers are has really helped. Biopsies done? None of my business, but still...
Mary