So my roof rails have rusted again and I've noticed a small patch of rust near the area. The problem I have is when I first got the car the garage I bought it off did the roof rails for me, this was before I knew audi did it under warranty so I know they wont touch it. My question is can rust be treated on these cars or does it need cutting out? Im just worried that its eating into the entire roof and it'll end up needing to be scrapped .