Kevin, yes you can remove the shields without ruining your phone. EMI shields reduce the electromagnetic field by blocking the field with barriers made of conductive or magnetic materials. Shielding is typically applied to enclosures to isolate electrical devices from outside interference. You most certainly want to clean the board and all components with 90%+ isopropyl alcohol and a soft brush. Check for loose, burned or severely corroded components. Reassemble after and see what you got. Hope this helps, good luck.