If you use a microwave:
Put a bowl of water with the juice of a lemon in it and boil it for a few minutes in teh micro. Let it sit there a few more minutes without opening to door, take the bowl out and wipe down the inside.
I've been using bon-ami to clean my toilet bowls, sinks, and tubs. Every now and again I have to use a little bleach to get the stains out or disinfect more thoroughly (I'm a whiteness and germless freak). When I use just the bon-ami, I put a couple drops of tea tree oil on my paper towel or rag as I wipe and rinse everything to give it that crisp clean smell.