PROBLEM: You are testing your newly created Unbounce forms and it counts as a conversion and lead. How do you remove the false data?
SOLUTION: As of September 28, 2012, there is no way to delete this information.
WHY: From Unbounce: "Unfortunately, Unbounce does not have the functionality to selectively delete leads at this time. However, this is on the radar and is something we hope to implement in the near future."