LOL I clean out my guys' litterbox once a week. They have several, all next to each other, and they don't really smell. I would try to get your guys back with a litterbox. How are you dealing with their waste now? Do they have a wire bottom cage? They really shouldn't just be peeing on the floor if they have a solid-floored cage. Also, do they have water available at all times, and do you know for sure that they will use whatever system you have for it? Some bunnies don't do bottles, and some don't like crocks.
What I used to do was scoop out the poops (with my hand :grumpy lol).
They have a solid bottom floor (with wood chips) and I remove the urine spots every 2/3 days. Recently, they have moved into a small shed so they have more room to poop and pee, lol.
They are in the garden from 10am - 8pm and the shed door is left open because they always go back to cage to pee.
They have a bottle for their water in the cage and a bowl out in the garden.
They do know how to use the bottle (they're using a bottle since before I got them) and they definitely know how to use the water bowl (resembles food
I will keep an extra eye on them to make sure they are drinking the water.
I'll also ask my dad to keep an eye on them during feeding times.
Thank you Claire