I needed to clean up my site and do a re-install of WP, so I ran Optimize to be sure the database was clean and light before backing it up. I then ran the back up and ran a clean install of WP. When I tried to upload the database, SQL said there were duplicates and couldn't overwrite. In fact, when reviewing the SQL file, it turns out there were tons of duplicates which indicated of course that the plugin doesn't clean up the SQL database at all.