I’ve never cleaned my run. My current setup is 4 years old. I use a cold compost system of wood chips, dry leaves, grass clippings and other miscellaneous yard waste that I throw in periodically throughout the year. The chickens turn it over when scratching and it just composts in place. It doesn’t look dirty, smell, get muddy, or freeze solid in the winter. I love it! I’m going to haul the top 6 inches or so out and into my garden as fertilizer soon, because it’s building up too high (as I keep adding material but don’t remove any). When I do, I’ll put down a new layer of chips and dry leaves and start over.