I looked at this thread because of a problem I have with my rear spoiler (thinking that removing/refitting might be the solution - clearly not). The problem is that I have a trickle of water (outside) running off the spoiler and then running down the rear panel - the thing is that it appears to be rusty (?) and is leaving a rust trail down the rear hatch panel. I can polish this mark off but I was wondering if there is a metal component in the spoiler that needs attention, now I know it's bonded on I'm wondering where this rusty water is coming from ?