On a new tab, press the following key combination on your keyboard:
Mac: Command-Shift-Delete
Windows/Linux: Control-Shift-Delete
Make sure you have the following settings in the window that pops up (including the "Everything" at the top!), then click "Clear Now":
Chrome
On a new tab, press the following key combination on your keyboard:
Mac: Command-Shift-Delete
Windows/Linux: Control-Shift-Delete
Make sure you have the following settings in the window that pops up (including "the beginning of time" at the top!), then click "Clear browsing data":
Internet Explorer
On a new tab, press the following key combination on your keyboard:
Windows: Control-Shift-Delete
Make sure you have the following settings in the window that pops up, make sure to uncheck the first checkbox, then click delete:
Safari
Newer Macs (10.10 and up)
Open Safari, click on the "Safari" option in the menu bar, then choose "Clear History":
Make sure you have the following settings in the window that pops up, then click "Clear History":
Older Macs (10.9 and older)
Open Safari, click on the "Safari" option in the menu bar, then choose "Reset Safari":
Make sure you have the following settings in the window that pops up, then click "Reset":
