De-soldering a PCB and soldering it on a new PCB

I have a PCB that has been under water. The pcb is corroded and need replacing. I have a new PCB where all of the components have to be solderd on to. So de-solderd from 1 board and solderd onto another. here is a picture of the PCB: [login to view URL] WARNING: the pcb contains SMD parts and 2 BGA (ball grid array) chips that also have to be solderd. Only accept if you are experienced in soldering this techniques. It is a expensive PCB and i do not want it ruined.