Hi , just thought id draw attention to this, i removed my front mudflap and wing liner to try and get access to the back of a dent i thought i might be able to push out from behind.  Anyhow thats by the by, however i found a big pile of wet muddy crap which had built up against the bottom of the metal wing , which wont help with future rusting . 
If anyone keeps their cars a long time like me , you might want to check yours out.
5 mins . Easy just remove the 2 or 3 torx screws holding the mudflap and peel back the liner , you will be able to remove it all then. 

Looks awful, I need to look at mine.