Cloudy Screen After Water Damage

My friend forgot to take his iPhone 4 out of his pocket during a swim in the sea. After around 20 minutes, he found out and put it into a bag of rice. I have fixed it with an alcohol bath and deionized water, but the screen is cloudy. The bottom 1 cm has some yellow tint, and the rest of the screen looks dark and murky. Is there any way to remove these, or do I have to replace the screen and glass? Or should I just allow the phone to dry out for a couple of days?