I clean spring and fall, compleate,I start from the top, take down the spider webs, broom the walls, scrap/wire brush any poo on the wall nest boxes roosts, shovel out, sweep and spray oxine on everything. also scrub/bleach/clean all waters, feeders and anything else. plus all birds get checked for any bugs and treated if needed, if bugs are found the coop the bird is from get treated too. this usually takes me a week or more but I have more then 6 coops and many breed pens. if an area get wet/ditry it gets spot cleaned as needed.
I use a layer of stall dry the shavings on top, unless there has been a moisture problem in the past I add the stall dry/horse bedding pellets then shavings