Actually, the best thing to do to clean logic boards is to use a soft bristle tooth brush, DISTILLED water, and dish soap. After a good scrub, let dry for at least 3 days before reassembly. Make sure you get any corrosion real good, and let it dry at least 3 days. Battery is the first to go, but it requires soldering - not saying a novice or noob cant do it, but its difficult and will require a magnifying glass and a steady hand. I would go with changing the screen first though, before getting into all that. could just be the screen that got damaged (well, more damaged than it already was).Theres a good repair guide on this site, good luck!