Every day i empty the girls litter trays, I throw away the soiled potty litter and put aside the unused bits, then I rinse the trays, not wash, I want to keep their scents in tact, but I rinse them in plain water because the litter goes like a sort of clay substance when it's soiled. Then I put back the unused litter I'd put aside and fill the trays up again with fresh litter from the bag.
It's part of my normal hamster housekeeping routine and works for us well, the girls always use their litter trays, they pee quite a lot because they eat a large amount of fresh food each day, fresh food has a higher water content.
So imagine my surprise today when I got the girls litter trays out to see they had both been used as normal but yesterday I had given them the wrong ones, Willow had Ebonys pink tray and Ebony had Willows red one!
They obviously weren't fazed in the slightest by each other's smells, they both just carried on as normal
It looks like Ebony can be a good girl occasionally