I was told by a friend with 20ish ferrets (and who part time's at a vet's) that Simple Green is safe. Wow - it's strong stuff though. I dilute it to the smallest dosage (chart is on bottle) and use it when I clean their cage floors. I rinse it also. It's good for cleaning accidents (ya, right- no accidents there) on the floor, but the scent doesn't discourage them from going there again. )-: Risa [Posted in FML issue 3265]