If you mean the AutoComplete dropdown list that appears in the address bar:
IE8 > Tools > Internet Options > Content > AutoComplete Settings > Delete AutoComplete history > [select items to delete] > Delete
You can set "Use AutoComplete for" to not record these entries in the first place.
Thanks! I was able to delete the browser history in the autocomplete dropdown and reset my autocomplete settings. That takes care of my problem whether or not CCleaner is designed to erase that info.