i have 4 cats & 3 littermaid boxes. they use 2 of them most of the time. i use mostly either tidy cats, fresh step or arm & hammer clay scoopable in them.
i've never completely emptied the boxes & washed them. i check them every day, for areas where the rake didn't get everything, etc. i do spot cleaning when needed...but i never notice any odor unless the containers are full & need dumping [or unless someone has just gone #2
]. so i've never seen the need for it.
