you asked why we use that day for cleaning and I let you know. I am not going to change the paper every time one of my snake pees. If I did that every time I'd be changing each tub 3 times a week. My tubs are far from dirty and I'm far from OCD with cleaning their tubs. These animals live in the wild where their own poop and pee is far from the worse thing they encounter. If you think 8ball or Ralph change their tubs everytime a snake poops or pees youre insane. I could be wrong but im pretty sure they do all their tubs 1nce a week.