I really need to start doing the same
I didn't start wearing a mask for cleanouts until last year or maybe just before that. When I saw how filthy they got over time, it made me realize just how much particulate matter I'd been breathing in.
Of course since N95s are pretty much unavailable right now you have to make do with what you have. I'm saving the last 2 N95s I have for full clean outs, and using standard disposable masks for daily under-roost scooping.