Is it worth trying to clean corroded mainboard?

Hello guys

i have recently bought this machine off ebay, from a seller stating he couldnt test the machine, so sold as faulty no returns.

machine clearly shows signs of spillage. bottom of the motherboard is corroded at two corners, a lot of contacts almost invisible under the layer of rust...

now, knowing, that this is probably beyond repair, what would you recomend me to try, to get rid of rust? alcohol? isopropyl? "whatever-you-call-it-conntact-cleaner"?

i dont even know, if anything else is working, i have basically gutted machine i need to get working... i probably could salvage superdrive, anything else is missing. no hdd, no wificard, no bluetooth module...

i know, motherboards are quite resistant to spillage (i know, stupid idea), having two, which survived spillage, could this one be salvaged as well?

thanks for ideas, sugestions or offers...:D:D:D