Step 1: Click on the ALT-key, when the menubar on top of the screen isn’t visible.
Step 2: Click on Edit in the menubar.
Step 3: Click on Empty Cache… in the menu.
Step 4: Click on Empty in the pop-up box.
Step 5: Click on Clear Now in the Cached Web Content section.
You can achieve this by pressing the following key combination:
On PC: Ctrl + F5
On Apple MAC: CMD + R