Hello! We have a few hundred empty spam accounts to delete.

All fields apart from name are empty, and cannot be deleted from admin.
So I need to delete them from the database 'customers' and 'customers_info' tables.

Is there any sql I coould insert, to delete a record where 'customers_email_address' = empty, for example.
(Sorry I don't know php)

We no longer get the spam accounts since upgrading, so would like to remove them now.

Thanks for any ideas.