Werkstat Acrylic Jett. Very easy to use - spray on/wipe off and it doesn't leave any residue on rubber or plastic. It leaves the surface with an extremely slick finish which lasts for several weeks.
If your car isn't new I'd recommend an application of Werkstat Acrylic Prime before the Jett spray. The Prime deep cleans and polishes the paint and the Jett protects the finish.
Some good advice here:
http://www.polishedbliss.co.uk/acata...-products.html