I have two girls in a SCN. I use Uhaul mats and fleece. The girls are litter box trained and use it for most all poops and even some pee. They stay in this cage Monday through Friday. Over the weekend, they are in another cage and I clean the SCN. I take everything out and wash all the fleece, uhauls and hammocks in hot water with All laundry detergent. I wash the plastic toys and litter pan with warm soapy water. I wipe down the large cage pans with critter wipes or Clorox wipes. I also wipe down the bars and sides of the cage. I use a little baking soda in the litter pan under the litter. In about two days, my cage starts to smell musty. My girls don't smell musty when I take them out to free range. The litter pan smells a little poopy when you bend down close to it but not musty. The overall area just smells musty. You don't even have to be bending down close to the cage. Does anyone have any suggestions for improving the smell or what I am doing wrong? I want people to enjoy visiting my girls but no one wants to smell a smelly cage.Remember to vote for my rats every day...see my signature below.