I have a radar detector which was submerged in water for about 24 hours. It was turned off and disconnected from power at the time. I have fully  disassembled it, let it dry, cleaned with isopropy + cotton bud, cleaned with isopropyl + fine tooth brush to loosen remaining corrosion. It is looking fairly clean now.

What else can I do? Is there anything I can put on it to prevent corrosion? I thought about crc but think it might do more harm than good? 

On a side note while cleaning one side of the board the isopropyl seemed to part dissolve some sort of coating, like a lacquer which has now left a sticky residue what could this be?