Every time you visit a website, your computer requests IP address for the website from your default DNS server. Then it caches them locally on your computer for some time to speed up the web access. If the IP address is cached, your computer doesn't have to request the IP address for some website anymore. And that leaves a trace. Even in private browsing.You can check them if you typein the command line (CMD)Cleaning them is really easy. Just typein the command line.You can make a batch file to clean them faster:Open Notepad, and type:Save the file asand run it.