Baking Soda Scrub

Several of my mixing bowls have a funky greasy crud on the bottom (probably from sitting in the sink while other things get rinsed around them). 

I decided to experiment using a not-so-secret ingredient:

Baking Soda!
I simply made a paste of a large sprinkle of baking soda and a bit of water, and scrubbed it around with my fingertips. 

It's not perfect, especially around the raised markings on the bottom, but it's so much better!  I ended up doing 3 bowls this way, and they look much nicer.  What fun uses for baking soda have you found?