RSS feed without Styling
you can copy views-view-row-rss.tpl.php to your theme folder 
and then 

&lt;description&gt;&lt;?php print $description; ?&gt;&lt;/description&gt;


replace with

&lt;description&gt;&lt;?php print preg_replace("/&lt;style\\b[^&gt;]*&gt;(.*?)&lt;\\/style&gt;/s", "", $description); ?&gt;&lt;/description&gt;


it will remove css

if you also have inline styles then you need this

&lt;?php $description = preg_replace('/(&lt;[^&gt;]+) style=".*?"/i', '$1',$description); ?&gt;
&lt;description&gt;&lt;?php print preg_replace("/&lt;style\\b[^&gt;]*&gt;(.*?)&lt;\\/style&gt;/s", "", $description); ?&gt;&lt;/description&gt;