My car is all of one week old! What is very noticeable is that after rain the front, roof and sides are still spotless but the tail end, number plate, trunk lock etc., are really dirty. I have never experienced this with a car before and I think the spoiler creates a minor vacuum behind the car allowing the front to cut its way through the world.

One thing is certain, Honda will have had it or a model in the wind tunnel for analysis!