How do I "depersonalize my motherf*cking youtube experience"?

Recently I noticed that no matter what I do youtube seems to “remember” now what content I viewed before, and no longer shows the videos related to the one I am watching at the moment (talking about that list of videos on the right) but is actually showing suggestions based on what I watched earlier. It started a few months ago. What is happening here? How do I stop it? (clearing the browser cache doesn’t work -> cookies?) Have any of you encountered this? It’s the same thing as the blasted google “localized” search… annoys me to no end. Help!