Your going to laugh at this, but check the front wiper arms, not the blades. They are aluminium and have a tendency to rust, yes aluminium does rust but its called oxydisation. They are very difficult to obtain through dealers who will charge huge amounts if you can get them and I couldn't, so you will have to clean them up yourself. Not a problem to do, but by God they look rough as a badgers arse without a respray.Seems to be a inherit issue with Z's,
Jeff