My 535I has been sitting for 5 years and was covered in a moss like green stuff. I've washed it off but the paint is dry looking and there is some eveidence of the moss still there. I can't really scrub it out so what is the best attack on it? I should specify - what can I do out in the garge about it? What waxes or machines should I use. Should I just splurge and take it to a detail shop? How much could it be? The body it not perfect but hey, I'd have a few rock chips in me after 18 years too.