How to remove the explicit label from a song

itunes

I bought a song from iTunes that is marked as explicit. However, the song is not actually explicit. When I try to edit the song's info in iTunes Music Library.xml, it simply reverts to the original information upon opening iTunes. Is there any way to remove the explicit label?

Edit: I would prefer to do this without any third party software, but it doesn't matter too much.

Best Answer

Remove rating for one song

The app subler allows to edit a song's info manually. I've successfully tried version 0.14 in Lion.

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Remove (suppress) ratings for all songs

You can choose to not show explicit labels for all songs in the parental controls of iTunes: iTunes Preferences -> Parental -> Show content ratings in library