Hit the Command and Y key at the same time.
Click Clear Browsing Data (on left side of screen).
Select the time frame (it is encouraged to choose the beginning of time).
Click Clear Data button at the bottom of the window.
Hit the Command and Y keys at the same time.
Click Clear History in the upper right corner.
Select the time frame (it is encouraged to choose All History).
Click Clear History button.
Click History> Clear Recent History