I have the same philosophy as Asbojohn, I don't clean my work car but feel the need to have the Morgan ready for inspection at anytime. I have this feeling that classic cars will attract continuous attention and therefore want mine to be always at its best. My time investment is not huge, a waxy wash every 2 or 3 dry trips and a polish 4 times a year.
I have to admit that I clean every car that I own to the same degree. That means at least a weekly wash and monthly Zymol treatment. I am however envious of the more relaxed brigade!