In TivoWebPlus, click on User Interface -> To Do
From there you can create a blocklist with the show names you want to delete. Then you just need to load that page each week and click the "Delete Shows" button at bottom of the page (the shows will automatically be selected every week to be deleted).
I'm not sure if there is a way to automate the process, but this way is definately faster than doing each show one-by-one on the tivo itself!
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