Interior first followed by hood if required, wet body, glass and wheels down with hose followed by wash and wax shampoo applied with a wash mit, rinse off with a hose, wheel arches then hosed followed by wheels applying wheel cleaner if required then rinse with hose. Finally dry car with soft towel so no water spots remain. Apply polish/wax and buff to a shine. Use household glass cleaner to finish off. Polish/wax only needs doing a couple of times a year if you keep on top of it.
Use this sequence to clean the Funeral Fleet at my casual job and this is done after every outing. Never use a pressure washer or a hose with an attachment on it that produces a strong jet, just an open hose. only exception to that is maybe the wheel arches to shift and mud buildup. Always use a grit catching grid in the bottom of your shampoo bucket so you don't pick up grit and drag it across your paint to cause scratches. Use a different mit and brushes, sponges to do the wheels.