I highly recommend Fizik microtex bar tape. I recently switched out my bars on my new bike, necessitating a new tape job. The white cork tape that came on the bike had gotten pretty dirty very quickly (a couple of rides on the trainer plus two or three on the road). I put Fizik tape on the new bars and so far so good. It is easy to clean, but more than that, it just doesn't seem to attract and absorb dirt the way cork does. (I rode a season with light pink Fizik tape and it didn't get dirty at all).

My Bianchi has dirty celeste cork tape. I try to clean it when it gets really dirty. Soap and water works OK, but bike wash works better (I have the scary bubblegum pink kind from Finish Line -- called "Super Bike Wash"). One of these days I'm going to put microtex tape on that bike too.