I recently removed a rainguard from the sunroof of my a4 and the rubber seal that contacted the roof left a yellow stain...
whats the best way to get rid of it??

ill post pics if u need any, but its pooring right now

thanks

 

Try a cleaner wax or Isopropyl Alcohol (IPA)

 

Meguirs makes a good one. I've used it before and it works really well. It's in a dark red bottle.