I found this article about 75 great uses for baking soda and tried this one out. It said to add a cup to the toilet, leave it for an hour, and then flush. It will clean the toilet and absorb the odor.
I didn’t notice any immediate results. But I think once we move, I will for sure try to make this into our normal routine. Maybe once a week would be good? Baking soda is so cheap, and it doesn’t have all those nasty chemicals like the drop in toilet bowl cleaners, so its worth a shot!