My coop cleaning doesn’t really happen on a strict schedule. Instead I use my nose and eyes to decide when the bedding needs to be changed. Any slight whiff of ammonia triggers an immediate cleaning. Ammonia fumes can be dangerous to the chickens and cause eye and lung problems.
Sprinkle food-grade Diatomaceous Earth on the floor, in the nesting boxes and over the roosts. Avoid breathing the airborne dust and take care to keep the chickens out while you are sprinkling the DE because the dust can be a lung irritant. Take this opportunity to run your hands along the roosts to check for splinters and mites (black spots or blood smears indicate the presence of mites so an extra sprinkle of DE is in order).