Just had a spam attack, about 90 comments over the course of two hours I was away from the computer. Not a single one is visible because every one was caught by my filter. How to delete them all? Comments Mass edit mode → Search for IP → Check all → Delete checked. Basically less than five clicks to delete 90 comments. The search could have keyed on any part of the name, email, or comment. It took longer to write this sentence than it took to delete two hours of spammers work. This isn’t a new 1.3 feature, this has been in WordPress for months.