This method doesn't seem to work, even though logically it should. If I delete all songs from the cloud using the above method, and then update iTunes Match, all of the songs that were in the cloud show up in iTunes again.
The reason this is an issue is I'm trying to force iTunes Match to attempt to match songs again, but if they've already been added to the iTunes match database they simply match with the songs in the database rather than Apple's iTunes store database.
Any ideas on how to truly clear the iTunes Match library? Thanks in advance...