I am really picky about this, so I am the wrong person to ask, but I wash my car once a week and it looks good (to me) for about 1 day. But you are talking to a guy who takes his wheels off every sunday to clean the insides and to clean the suspension, and someone who waxes his doorjambs. I would say that silver is the easiest, yellow, white and red in the middle, and blue and black the hardest. The blue dulls very easily with dust and pollen, but I think it looks the best when clean.
My Rex is blue, must agree, it looks great when its shiny and blue. Right now in Aust, its spring/summer and there is all pollen and dust in the air, and my car has this constant dust film all over the car.
But I can't see myself in any other colour than blue.
Blue is easy to clean, I wash my car once every two weeks and even when it's dirty it looks darn good. But it all depends on your opinion I love the WR blue and wouldn't take any other color. If color is your only problem with car choosing you're in good shape. Good luck
Well I can tell you its easier then black. Also even when its KINDA dirty, it still looks clean. But I just finally washed my car in like 3 weeks because its been raining and all I can say his wow! The car looks so awesome when clean. When it gets dirt on the car, it makes the blue look really cheap. So anyways blue is easy to mantain and its also really rewarding when its clean, just like if you got a black car.