clear POST information

I have a small python/django web site and I'm using a html form POST some information, annoyingly however this information is stored in POST so when a user refreshes in say IE/chrome they get that warning message about the page containing POST data. How do I clear the POST data after it has been processed so a user can refresh and not see this warning message?

 Also I have some logic as follows that detects a POST

    if request.method == "POST":
         blah blah

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This is fine when I actually post the form, but when I refresh the page it also detects the POST and does the logic that I now dont want to do.
How can I solve this also??

Thanks