Human litterbox hygeine is pants.

Large clean litterbox

Which would you prefer? It's obvious, isn't it?

The bottom one is small, full of pee and poo, not very much litter and a horrible plastic sheet at the bottom that will interfere with digging.

Yet humans are still expecting us to use this kind of litterbox. They would be disgusted at a lavatory full of pee and poo. 

They think we will manage somehow! And many of us do, putting up with trying not to get our feet wet. Ugghhh. But it is not good enough. 

Box with deposits

Why are they so lazy? They are far better at getting rid of their own bowel and bladder deposits? Most of them flush regularly. Why be so idle about ours? 

Alas, the only way to get your human to be less slovenly is to pee or poo outside the box.  That'll show them.