Individual survey responses can be deleted from within iSalient. This can be be especially useful if you would like to take your own survey before making it public.
After logging in to iSalient, go to Reports->Individual Responses.
Select the survey and date range you would like to export. You can leave the date range blank to export all results from the selected survey. Click "Submit"
You can view a survey response by clicking on the date. Check the box(es) next to the responses you would like to delete, and then click the "Delete Checked" button.