Scientific testing has proven that you can was and dry and entire classic Mini in less time than it takes to clean an 18 inch wheel on a Golf GTi. This leads me further to suspect that the Mini can be completely polished, cleaned inside and a coffee break completed by the time the last 3 wheels have been washed. As I live in a dusty lane I have to further conclude that by the time the Golf has been washed and dried, the Mini will again be muddy and in need of a wash.