1. Click the Tools menu (three dotted lines in the upper-right corner).
  2. Select History. 
    Google Chrome history menu showing Clear browsing data
  3. Select Clear Browsing Data from the left-hand side. Set the Time Range set to All Time. Check-mark Cookies and other site data and Cached images and files and select Clear Data.
    Opened clear browing data menu with All time, cookeis and other site data, and cached images and files selected