I just left my job (yay! freedom! money is for suckers) and realized I forgot to clear cookies on my PC. I can call an (ex) coworker and have them do it maybe, but I'd feel safter if it could be turned off somewhere in officially. Is there a way to make it so that the cookies on that computer no longer allow login to Google services? Reddit might be nice, too.
As pointed out in this Web Applications Stack Exchange answer, you can change your Google Account & Reddit passwords to prevent any one else from accessing your accounts from your former office PC.
On a computer (and not mobile device), log into gmail. Once inside, scroll down to the bottom of the page and on the right-hand corner you'll see "Last account activity" and below it the word "Details." Click details and a window will pop up with a tab that says "sign out all other sessions" click that and your done signing out of every location you may be logged in.
you can also view your current logged in device from here: