The best solution I've found to remove corrosion is boiling water. I take the Main PC Board out of the phone, boil water in a coffee cup in a microwave then place the board in the water. VERY IMPORTANT DO NOT PLACE THE BOARD IN THE MICROWAVE. After a minute or two carefully remove the board and scrub both sides with a tooth brush. When the board is completely dry return it to the phone. I've used this sucessfuly many times with water damaged Ipods, Iphones, & other electronic devices at the repair shop I work for.