O.K. stupid newbie warning...but I have to ask. How often do people spot clean their cages? And, how much bedding do you replace daily? I just keep thinking I'm going through an ENORMOUS quantity of shavings. Since the boys are new, do they start to narrow down where the pee/poop? (They seem to be whizzing a trail of destruction through the cage.) Am I cleaning more than I need to? I build two hidey houses out of bent grids....I expected poop, but they seem to pee in there as well. Odd, because I thought they didn't like to pee where they slept. Any insight from anyone?