[themccannman]

Number one concern is any minerals/salts in the water that contacted the parts. Rain water is pretty clean but not necessarily entirely exempt from containing this contaminants so whether it was rain or flood water there is still a risk. Number one priority is to disassemble everything, wash it all with distilled/deionized water to remove any mineral deposits, then wash with alcohol and let everything dry. As long as nothing was powered on and you washed everything thoroughly it should all be as good as new.