How do you remove all metadata from a mp3 file. For example remove album art. I want to do this because I want to merge a couple of mp3 files into an existing album but use the existing album art.?

How do you remove all metadata from a mp3 file. For example remove album art. I want to do this because I want to merge a couple of mp3 files into an existing album but use the existing album art.?
BatchPurifier (http://www.digitalconfidence.com/BatchPurifier.html) is able to remove metadata from MP3 and other file types.