NOTE: You can also hold Ctrl + Shift + Delete and skip to step 3.
Click on the settings icon that appears to the right of the address bar. In the newest versions of Chrome, this appears as three horizontal lines and in older versions will be a wrench icon .
From the menu, select Tools > Clear browsing data....
Check the following:
Select the beginning of time in the drop down box and click on the Clear browsing data button.
NOTE: You can also hold Ctrl + Shift + Delete and skip to step 3.
Click on Tools (the wrench icon) > Options.
Click on the Under the Hood tab, then the Clear browsing data... button.
Check the following:
Select the beginning of time in the drop down box and click on the Clear browsing data button.
You will need to restart your browser for the changes to take effect.