Here's some ideas for cleaning and deodorizing litterboxes that I find work extremely well:

Litter Box Cleaner and Disinfectant

1 tablespoon liquid hand soap or scented liquid castile soap
1 tablespoon chlorine bleach
1 1/2 cups water

Add soap and bleach to a 1-pint plastic spray bottle. Add water and shake. Spray the empty, rinsed box thoroughly and let it sit for 2 minutes. Rinse, dry, and refill with litter.

Litter Box Deodorizer

1 (16 ounce) box baking soda
4 teaspoons dried mint

Add the baking soda and mint to kitty litter. Stir it up, and keep it clean.

Thanks so much for looking! Hope this was helpful.