Just as an aside - you don't need to manually purge the CDN every time you make changes. If you add a parameter to the stylesheet URL you can update this in the template and force the CDN to get the new version e.g.
On our site we just cycle through the letters on the end and change the numbers each time we run through the alphabet - works for us .
Code:
<link rel="stylesheet" type="text/css" href="http://cdn.domain.com/styles.css?v=1.0.1.0c" />On our site we just cycle through the letters on the end and change the numbers each time we run through the alphabet - works for us .