After YouTube auto login was implemented, I started using a cookie manager. With one or two clicks you can enable or disable cookies, which logs you in or out. I don't want every random reddit video that I click on to show up in my YouTube history, so generally I leave it blocked except for when I actually want to view my subscriptions on YouTube.
Also, a fast way to do a logged out Google search, without switching browsers or entering private browsing mode, is to bookmark one of the IP addresses in the 74.125.225.0/25. Since cookies are domain specific and you're not on google.com, you'll be logged out.
Also, a fast way to do a logged out Google search, without switching browsers or entering private browsing mode, is to bookmark one of the IP addresses in the 74.125.225.0/25. Since cookies are domain specific and you're not on google.com, you'll be logged out.