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Here is the best way to clear everything:
Internet History-
In Internet Explorer, click 'tools' (top of the page)
click 'Internet Options'
There are 3 areas on that menu. 1 of them will have 'delete files' for files and the other 'clear history'.
Click on one, then when it is done, click the other.
Netscape should have something similar.
Now, right click on the task bar. It is the bar at the bottom of the screen with all your windows open. Click 'properties'. That menu will have a tab called 'Start Menu Programs'. Click the bottom button called 'clear' and you are all set. You can go back to the history area menu and change it to delete files after 1 day instead of the default 20 days.