Going to work - it is better to keep green?

Now that it is spring in bloom and summer is coming soon, I have an important dilemma: going to work by car or by bicycle. Many people in my town choose bicycle, because it gasoline is very expensive and cycling is less harmful for the environment. What I'm not sure about is whenther it will be great if I come to my work on bicycle. I don't wear a suit, but still I should look spin and span. Will I look clean after a 20 minutes' ride on a bike? Besides, I'm afraid I won't look as reputable as if I went there by car. The green aspect of the matter is obvious, but... So, I can't decide. Probably bike. Or car. Hmmmm...