What you need to clear is form completion/form data which is sometimes a little hidden.
I'm not sure what sort of browser you have - it doesn't sound like Safari, so I'm going to assume you are a windows user.
Here is a link for
internet explorer:
http://windows.microsoft.com/e...te-saved-informationOne for
google chrome (see bottom where it has a dropdown link to 'Delete your form data'
https://support.google.com/chrome/answer/142893?hl=enIn
Firefox:
Tools > Options > Privacy > Firefox Will: Use custom settings for history > Uncheck Remember search and form history
Incase you are a wonderful Mac'er like myself here is
Safari:
Safari menu > Reset Safari and select "remove saved names and passwords" and "remove other Autofill form text".
If you use something else, I'd scan the area where you could select cookies, etc and see if that is an option.