This was what the dev sent to me. You have to run this directly against your DB. There is no front end to perform this task.
delete from wp_wbz404_logs where redirect_id in (select id from wp_wbz404_redirects where status = 3);
delete from wp_wbz404_redirects where status = 3;
Changing the number 3 to the following is supposed to remove the other items:
1=manual, 2=automatic, 3=captured, 4=ignored
