'''++John Watson++''' the very first thing you want to do is stop using it. Then disassemble it using guides like this [guide|108101]. Clean everything with a high grade isopropyl alcohol 90%+ and a soft brush. Use this guide [guide|5825] for that. It was written for an iPhone but all the points are still pertient to yours as well. Once done, you could reassemble it to re-evaluate or you can take your chances and repalce the screen [guide|108012] since it seems to have taken most of the damage.