How to clean the screen on a Samsung Blackjack

Question: I recently purchased a Samsung Blackjack II. I have had it less than a week...there is so much dust that has accumulated under the screen and it is driving me crazy. I carry it in a leather case all the time. Is there a safe way to clean the screen and once I do, how can I prevent this from happening!! I have never had this problem with other cell phones I have owned. Thanks so much!!