How big is your litter tray? When I first got Waffles I had a small ickle tray and she always hanged her bum over the edge so I have a HUUUUGE one now

I do it a little differently. I completely clean it twice a week and then scoop it everytime she uses it. i only use a dirt cheap litter though because after all she just toots all over it and I haven't had a problem with odours so far.