Door Speaker
 

As you can see in the picture, there's a dirty mark on the door speaker cover and I can't get rid of it completely by only cleaning the front so need to access the back as well. Does this cover just unclip or is it necessary to remove the doorcard to get behind it? I'm reluctant to just 'give it a go' in case it's screwed in from the inside and I end up breaking something.

http://i.imgur.com/pGQyQAth.jpg

Part of the door card, not removable (glued in from behind).