From a blank IE window, go to:
1. Tools
2. Internet Options
3. Click on 'Delete Files'. Might as well check 'Delete all offline content'
This works better if this IE window is the only one open.
To be really thorough, you can do it manually, but this depends on which OS you are running. The idea is to delete everything (except vital cookies) inside the hidden folder C:\Documents and Settings\username\Local Settings\Temporary Internet Files\Content.IE5 (exemple for W2K and IE 5.5, should be applicable for XP and IE 6 as well).
[This message has been edited by monahos (edited 02-27-2002).]