I only clean mine 2x a yr spring and fall so I can't help you in that but I would put straw down under the roosts they poop in there sleep and most roost to sleep
K so first that is partical board not plywood and sorry to say is gonna be a pain to clean and keep the smell down cause it is porous is the box with straw in it there nestbox for that many you'll need 4 nestboxes that is why they layed an egg on the floor someone was probably already there...