cowon s9 + mediamonkey playlist help

[darkmetal]

Hi there i have had cowon s9 for year now and have been using media monkey to create playlist and sync up my music to my cowon s9. My problem is when i delete a playlist in media monkey off my cowon s9 under devices. It deletes my playlist, but if i go into my cowon s9 folder under my computer and then click music. The folders that were created are still on the device its self. I didn't know this before, so everytime i delete my playlist and resync it with new music or add to it. The old music is still there, but in the folder directory.

Anyone know how to fix this problem or direct me to better program that will delete my music playlist along with the music folders? Its pain in the ass going back and deleting all the folders made from that playlist to get it off my device.