Varnish ESI breaks on html comments

Question

I'm running a drupal site and implementing esi support.

So far it went ok when I implemented the basic esi support on blocks like this:

<esi:include src="blabl"><esi:remove>I am a not yet from esi block <!-- block --> </esi:remove>

Now this worked very good as long there were no html comments inside tags. But when there are html comments inside esi removes only a part of html comments. This results with all following html being commented out and not being displayed

Like this after it's processed by varnish:

I am a block from esi! <!--

Now it would be possible to remove all comments from html, but that doesn't seem like the solution.

Has anyone had similair problems? I'd be very thankful for some help