There should be a factory reset option in the settings, but if it's the Netflix recently watched section, it won't affect that as far as I know.
Possibly you could go to setting and alter the Netflix settings to not allow searching. I believe that will only display your current instant queue and not all the suggestions, recently watches, etc, items. After watching a sufficient number of titles, the offending items should have scrolled off the recently watched list, and you can turn searching back on.
There may be a way to alter the recently watched list from Netflix's site, but I'm not aware of it.
-- GandK Labs
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