Baking Soda is another one that we use a LOT of for cleaning. Works as well as most of the other abrasive cleaners - but I have heard better for the environment.

Vinegar - I use it, DH uses it more - I usually protest the smell, but have learned to live with it.

Got good sources for Citric Acid? I use it to clean my Zojirushi water dispenser (which is in dire need of cleaning again despite my insistence on filtered water use).