My coop isn't deep enough (the pop door is too close to the floor) for the deep litter method, I think. It's a 3x4 coop and I'm housing 3 standard birds. Straw is readily available to me and free. If I use a layer of that on the coop floor, how do I go about cleaning it? Would I just have to muck the whole thing out? And if so, how often?