Meguiars everything in these steps..........wash, clay bar, precleaner wax, polish, then a good waxing. Looks factory new when done and is usually done when the water won't bead any more when I wash it. If I had to guess I usually do that about 10 times a year including winter when it needs more protection. Wash it once a week even if it doesn't need it in the summer, wash it at least twice a week in the winter including a very stringent underbody wash, no matter how cold it is. Prestone stain remover for the carpet and mats when needed, shop vac it once a week.
Which reminds me I am past due on my cleaning service this week 
