Part I: How To Clear Up Cookies Fastest And Easiest Part II. Therefore, this article is a guide that will tell you the ins and outs of successfully deleting cookies within the Mac device. Or, these websites might display old usernames you don’t know the passwords to or you don’t utilize anymore.įrankly speaking, it is necessary for you to delete cookies on your Mac sometimes. Some websites show offers you don’t want to see every single time. There are websites which raise the prices of their products the next time you visit them. So, why would it be necessary to delete cookies? Well, cookies might be necessary for a website’s or business’ marketing tactics. These cookies are stored within your computer device and they help the websites you visit recognize you (or your device) when you visit them again next time. Cookies are simply parts of data (tiny pieces of information) from different websites you actually visit.