i clean the litter tray daily in Buzz's hutch, then clean it out every other day, his hay trays get replaced if he hasnt eaten it or as it runs down. the guineas need cleaning out every other day, but its a case of about 70% of it is clean but there are piggy poos everywhere! theyre messy so and so's except my solo boy piggy who wees and even poos in one corner only, so thats scooped out every day and he gets cleaned completely about twice a week.