How to delete streaming history on Roku?

Usually when relatives visit, I enter Guest Mode and have them use their own Roku account.   I didn't get a chance to do that last time, and now Roku thinks I like watching Florida local news and religious programming.  Now instead of Roku knowing my true viewing information to properly target advertising to me, it's showing me completely unrelated shows, so I had to hide recommendations.

Please let me know how to delete this month's viewing history, either online or through the streaming device.  If it's not available, please add it as a feature to allow you to properly target your audience.