Although you may have set your podcasts for automatic cleanup when you added the feed, it is possible that the sheer number of podcasts on your system may begin taking up more space than you expected. It's time for a little cleanup.
Click the Cleanup tab, and then select one of your feeds from the drop-down list. A list of episodes associated with that feed appears in the lower pane (see Figure 12-10).
Figure 12-10 From the Cleanup tab, it's easy to select and clean up old podcasts. Select all or choose from individual episodes.
Select the episodes individually or click the Select All button to delete everything. When you are ready, click Delete.