You can delete a survey, when required. Deleting a survey deletes all details for that survey, including the participants’ response. If you want to delete only the response, you have an option to delete survey response. In this case, the survey is still available if you want to use it again. (Please see Delete Survey Response for more details.)
Click on Surveys link available in the left sidebar. The sub-links appear as below.
Click on All Surveys link. The list of all surveys appears as below.
Locate the target survey in the list.
In Action column, select Delete button. The backend system asks you confirm if you want to delete response for the selected survey. Click on Yes to confirm it.