Why do you wash your vehicles if it rains that often?
Unclean air and road grime.
I used to use Meguiar's, and I think it's an excellent product, but now I use Mother's Ultimate Wax System (Steps 1, 2, and 3). I like it a bit better, but it is a lot of work. I always wash thoroughly before applying wax, otherwise I'm just sealing in road grime.
Wash, rinse, wash, rinse, wash, rinse, dry, apply polish (Step 1), buff polish, apply glaze (Step 2), buff glaze, apply wax (Step 3), buff wax. Whew! At least a couple hours, easy. Actually not so easy, and I have to do it with the sun not out because otherwise my dark paint will get so hot the polish/glaze/wax will bake on, and instead of
buffing it off I have to laboriously
scrub it off. I try to avoid that if the paint is hot by applying polish/glaze/wax to just a small part at a time (driver's side) and then buff it off before it bakes on, but it's still a race.