Well done, you are lucky. I had the same, just a little water, no corrosion at all, but it would not work after drying out. Had to replace with a new one, which is working.I have the old one here, it looks brand new.
Dave

 

Hi all I have the same problem , both keys don't work at all I've opened up my antenna box and no water or corrosion, hasn't worked since I bought it. does new antenna automatically recognise your keys ? Regards