Ryan McCue

<p>Many spammers bypass the comment form and send requests to the WordPress backend directly. This plugin creates a “nonce” field for your comment form, similar to the ones used in the administration backend.</p>
<h3>Troubleshooting</h3>
<p>RSCV not working? Use the following steps to try and solve the problem.</p>
<ol>
<li>Make sure <code><?php do_action('comment_form'); ?></code> is in your template’s comments.php, inside the <code><form></code> tags.</li>
<li>Still not working? Ask on the forums.</li>
</ol>


Really Simple Comment Validation

Adds a nonce field to the comment form to deter some comment spammers who bypass the comment form.

<p>A plugin to remove all pending comments from your DB in one click. A useful tool if you’ve been heavily spammed or have not managed your blog for a while and would just like a fresh start for your comments. Note that this will not modify any previous that are not marked as unapproved.</p>


Bulk Comment Remove

A plugin to remove all pending comments from your DB in one click.

Really Simple Comment Validation vs Bulk Comment Remove