If you need to clean the browser cache / history in the Metro version of IE 10 do the following:

Press the Windows key to get into the Start Screen.
Then run Internet Explorer Metro

Press Windows + C key combination to open the Charms bar.
You can also display it by touching the right side of your tablet or the mouse cursor to the right of the screen to display it.

Choose Settings
This will open the settings menu
Then click on Internet Options

Click Delete Browsing History
This is all you need to do.