When I clean its not a 100% clean, I just use small hand held broom to clean up most of it id say about 80% of the frass.
I just bought my 500 4 months ago and their just now producing as I finally have adult males. I bought them at nymphs -1/2". Prolly have about 200 adult females and about 5 adult males so far. There is about 100 nymphs now in there about 1/4".