Step 1: Open Chrome.
Step 2: On your browser toolbar, click the Chrome menu .
Point to More tools, and then click Clear browsing data.
Step 3: In the "Clear browsing data" box, click the checkboxes for "Cookies and other site and plug-in data" and"Cached images and files."
Step 4: Use the menu at the top to select the amount of data that you want to delete. Choose beginning of time to delete everything.
Step 5: Click Clear browsing data.
Pleaser refer to https://support.google.com/accounts/answer/32050?hl=en