Change spot color swatch to [None] swatch script

If you need a script, the answer may lie in this thread (towards the bottom of it): [JS] delete swatch without replacing

Otherwise, nicolas' idea works; OR go to the swatch menu and delete the swatch and replace it with [None] (assuming you don't want the swatch again)

So it sounds like you have a bunch of objects who's fill, for example, you want to delete without having to select each object individually?

You don't need a script for this:

Make sure nothing is selected in your document, otherwise it only effects what is selected. Use Edit > Find/Change... and click the Object tab. Click in the "Find Object" box and choose prices swatch as the fill colour, click OK. Click in the "Change Object" box and choose "None" as the fill colour, click OK. Click Change All. Done.