Surf the classic car and similar forums - learn from the guy's who are real experts in body presentation.
a: Hose down to get rid of loose dirt etc.,.
b: Wash using a propriety car shampoo and a cotton mitt.
c: Start at the top, wash one panel at a time - rinse away suds before moving to next panel
d: Use a seperate cotton mitt for the door bottoms and wheels.
e: Dry off using Terry Towelling - Terry baby nappies are best.
f: Wash mitts, rinse thoroughly and dry naturally.
If you really want a super shine then use the Zaino System. Hard work, not cheap, not easy to obtain, but, reports claim it to be the best.