I cant delete posts the have guest as poster..

[luism]

I tried cleaning a bunch of spam from my vb and some of the posts remain but now have Guest as poster.

When I try to delete the posts it wont let me it give me an error..:

"Spam Management
Your criteria is not restrictive enough and might return too many results. Please restrict your criteria and try again."

See pic attached.

What can I do I want to wipe the VB entirely and start from scratch since google banned my domain name

I cant choose the box and delete post because of that error above.

Thanks!