Oh thats cool, we use liners in one of those things too so its just a quick pull and the box is clean. Those dam liners are a life saver let me tell you, no more scooping the pooping FTW
No wonder your box stinks .. you gotta scoop the poop, not just wait til it's full and empty the litter.
I scoop the poop and pee out everyday, then change out all of the litter once a week.
Go to wal-mart and buy their scoopable brand .. and quit spending so much on name brand cat litter so you can change your box more often