If it didn't get as clean as you want, move the jewelry around, press it down a little bit, pour more boiling water and add more soda. Repeat as necessary!
If you need to remove tarnish from silver (more than just a few pieces), do this process in batches.
Kind of like magic but, really, I guess it's chemistry?
Click on these links to see the other tips about tarnish removal from silver: Tip #1, Tip #2, Tip #3
Now, girl, go clean that tarnish from your silver jewelry!