My chickens live in a big barn stall. I’ve done the deep litter method since the beginning of autumn. Last year deep litter worked out great, but this year I must’ve done something wrong, because underneath the first few inches, there’s a very strong ammonia smell. My local ag store told me to use lime, and I’m wondering how soon after lime can I let the chickens in? And how long should I wait to rake out the stall? I'm concerned about breathing it in.