How do you delete a mask in Lightroom?

How do you delete a mask in Lightroom?
In a nutshell:

Apply a graduated or radial filter as usual.
Select the Brush tool.
Select Erase.
Adjust brush flow, size as desired.
Add Auto Mask if desired.
Brush in your image to erase the effect.

In a nutshell:
  1. Apply a graduated or radial filter as usual.
  2. Select the Brush tool.
  3. Select Erase.
  4. Adjust brush flow, size as desired.
  5. Add Auto Mask if desired.
  6. Brush in your image to erase the effect.
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