The Netflix Instant Queue serves as your portal for streaming Netflix movies. You can add movies you plan to watch in the future to your queue so you don't have to search for them later. Once you watch the movie, it appears under your recently watched list. Netflix does not automatically delete movies that you've already watched from the Instant Queue, but you can remove them yourself. You cannot remove movies from your recently watched list.
Go to Netflix.com and sign in.
Click "Your Queue" at the top, along the grey banner.
Select the "Instant" tab. Find the movie you've already watched from the list. Click the "X" under "Remove." A message will appear confirming that you deleted the title.
Click "Update Instant Queue." The movie will no longer appear in your queue.