Wash it regularly,first and foremost.Second,always wax it well before winter and use under car washes after snow to get rid of the salt residue.Wax the door jams and clean the underside of the door,as you will get muck in the drainholes,which will lead to rust from the inside out.Use Zymol or McGuire waxes.And buy a good pair of shades,since you'll be blinded by the shine