how can I clear my search bar autofill?

Hi

If you are asking about Google Toolbar searchbar, you have to click
the Google's logo on the left and then click "Clear Search History"
option.
You can also disable saving search history, so after browser restart
it will be automatically cleared - to enter such mode, you have to
click "Options" button and clear the first selection box on the "More"
tab and click "OK".

Additional resources:

- Google Toolbar official support site
://www.google.com/support/toolbar

- How do I delete my search history?
://www.google.com/support/toolbar/bin/answer.py?answer=9271



Hope that helps!

Best Regards,
rolnick-ga