Wasted disk space

Disk space used for Podcasts builds up over time. It seems when some podcasts are deleted from iTunes the underlying data files are not removed. Even though I've listened to all my podcasts and deleted them many, but not all, are still in my podcasts directory.
Every month or so I have to delete/unsubscribe to all my podcasts. I then go and review the Podcasts directory on my PC and this is regularly over 4GB of data. I can sucessfully delete all the subdirectories of the podcasts directory and reclaim the wasted space but I shouldn't have to do this.
Can/does the iTunes software provide a way of syncing up what iTunes thinks you have with the contents of the Podcasts directory?
Thanks,
Ron MacRae

Select them in ITunes and delete them.
If they are not showing up in Tunes, you can delete them from the Podcasts directory.

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