About once or twice a week. When you've changed hem REMEMBER TO GIVE THEM SOME FRESH HAY! Remember to separate them if you have two. I normaly give them a carrot to nibble on.
daily
Every 1-2 months.
I clean out my hamsters cage twice a week.
about once a week works for me and my friends that have tortoises
it is unhealthy so you should often clean the cage.
you should clean your guinea pigs cage every 2-3 days just to make sure they don't get sick, and it doesn't smell. sak :)
you should clean it once a week
You should clean your hamster's cage every couple of days. PetProductsByRoyal.com
A horses stall should be cleaned every day if possible but if not every other day.
You should clean a guinea pig cage out at least once a week making sure you get everything out and disinfect it with cage cleaner at least once a month. you should also remove any uneaten food everyday so it doesn't attract flies etc
once or twice a week
every 4 days