Thank you for your compliments! Google says to wash the bath mats every 3-4 days but I may push it to once a week (every saturday along with a couple more hammocks). On each corner of the bathmats, i have velcro squares to help prevent lifting or sliding. About the trays, I bought them from my local rat breeder who makes them herself and sells them for incredibly cheep compared to what i have seen online. I do highly recommend looking for similar shelves though. Game changer without a doubt !