I have had deep litter for 4 years now and love it. I have concrete with pine shavings and it still works. I fractured my ankle in 2 places last spring right when we normally do a complete clean out-June. I was not even allowed on lawn for the longest time, my husband would get me onto the patio and herd the chickens/donkey up for me to see and pet on. So, my husband did all my chores-plus turned everything over in the coop and removed a few wheelbarrow fulls of the yuckest and added more shavings. I thought it would be a mess when I finally was allowed in. It was in pretty good by the time I was cleared to walk to the barn-but not allowed inside the coop, yet. By the time I was allowed to clean it out we had a early freeze snap, all that we had done was winterize, my husband had surgery and a hospitalization and It didn't get clean in the fall either. So 2 weeks ago it got cleaned out, my husband did all the heavy lifting-wouldn't you know I hurt my shoulder a month before. It was not gross, I guess because we added and stirred more than any other time, so it was like any other clean out. More layers and more compost but otherwise good, we did have to spot clean the walls, roost, nests and under the waters. In our hot, moist, climate shavings make sense. I love fall leaves when I can get them. I won't ever change from DLM, it works to well