I go by the 2-3 times a week schedule, more often when they are being held more often. You can see how oily they are after being held, so I'll usually give them a good bath after things like hair ring checks, or a general look over to feel for cuts/bumps, whatever. I do notice that they like to hang out in the dust baths which they poop in and pee in too. I keep it in the cage for 10 mins or so and take it back out. If they've pooped in it a ton, it gets thrown out, if they've just done a couple I just pick them out with my hands, and add more dust in to give them enough to really spin in. They need enough dust to dig and flip around on, so don't skimp. The more fine the granules of dust, the poofier and cleaner they get. - Jessica