Delete unused swatches in InDesign CS5, js

Hi,

I need to select and delete unused swatches in InDesign CS5. I looked through OMV in "Swatches" and "Swatch", but I could not find any function to select unused swatch and delete it.

Am I looking for it in the wrong place?

And I also need to read color values for used swatches. I got this in OMV and was hoping it would give me an array of the color values for all existing swatches, but I am only getting "Object color":

Thank you for your help.

Yulia