Remove all CSS classes from current document

It would be great to have an extension that would strip out all the existing classes from a document.  With DMX, you can remove specified tags from a doc, but classes are only attributes of the tag, so you can't remove them with any automated process.

To go even further, it would be nice to also have deeper control, like to choose from a list of classes in use in the file, and remove selected classes or all at once.  I would be happy with just being able to remove them all at once, though.

I have had to redesign a site before, and it gets pretty tedious "unapplying" a stylesheet.