Every time I bring in the car to be washed, I end up choosing add-ons at random.
I finally decided to look up which ones to get, and which ones to pass on.
Consumer Reports says get the undercarriage wash at least once a season, “especially if you drive through mud or live in a part of the country where roads are salted in winter.”
Wheel cleaning is good, but spray-on wax is purely cosmetic.
And here is the theme for the 1976 cinematic classic, “Car Wash.”