How often should you do a full cage clean?

[strwbie]

What I do is if my hamsters' bedding or cage starts to look soiled, I simply take out a third of the bedding and replace it with the amount I took out. I mainly focus on the corners and pee spots, though, since thats where all the mess tends to be. Of course you can also pick out poops daily that are scattered everywhere too, and maybe wiping sticky wheels or accessories. But never a full clean unless they have some sort of illness. It stresses them out, and in their little hamster brains they think they are in a whole new place!