Usually I've been more relaxed in how often I do a wipe of the bottom, but now that I've re-done my cages and nothing is touching the floor if there is poop it ruins the look lol So I'm in there every day wiping the poop and any dirt from the plants away. And then about every 2 weeks I'll take the PVC bottoms out and clean them with bleach, let them dry in the sun, and put them back.