How Do You Handle Litter Odor?

We have 3 furboys who have many miles under them. We too use Arm and Hammer litter for multiple cats. The trick is cleaning the box. I use one box and I clean the litter once in the morning and once at nite. Every 3 days I dump the whole thing, clean the box with soap and water and rinse with vinegar, then towel dry. People say they don't smell the box, which is a big fear of mine. I am not a fan of litter box odor.

Hope all this info, tips and suggestions help.