Add a cup of baking soda to the toilet, leave it for an hour, and then flush. It will clean the toilet and absorb the odor. So much better than chemicals! This site also has 75 other uses for baking soda!
Pinner says "Ok, I just tried this and it seriously did work. I did it twice on a burner that's had scorch marks for a year or more and they're gone! For anyone as OCD about cleaning as I am, this is a must!