Vista - Removing Album Art from Windows Media Player 11

I use Windows Media Player 11. I like to manually update my files because
Windows Media Player never matches the right information. All other media
information is manageable, but album art is a nightmare.

I have deleted all album art (using iTunes and Winamp to confirm) for all of
my files, yet when I click on the Library tab, and then Artist (for a list of
all the artists grouped alphabetically), some (although VERY few in
comparison to how many in total) still have album art, all of which I have no
idea where they came from.

Winamp and iTunes say that these files do not have album art, yet Windows
Media Player still magically does. I have deleted ALL of my music from my
library and then added them back in, to no avail.

I have gone in Windows Media Player's Advanced Tag Editor, and even IT says
the files in question have no picture. Yet, when in Artist view, there's the
album art.

How do I get rid of this album art? It's wrong, and when I find the right
album art, I would like to add it in manually. For now, I just want to
remove it so it doesn't show up. How do I do it?

All my album art are correct...some seem to have no album art but I just leave them like that...as long as I can still enjoy the music.

Not helpful i know...