i scrape the perches onto the floor and nest boxes the same when racing, but at this time when birds are rearing i leave the nest boxes until moving the youngsters but not onto the floor,big s@its when they come off the nest at this time i lift aswell,probably a full clear out once or twice a year,only thing i am going to start doing is a scrape over with a hoe every other day but not removing it,doesnt make me win,just suits me,each to their own.