[Wardad]

Atrocities,

Sorry to hear of your problems.

I have some experience with WET circuit Boards. Cold testing below 0c has a way of frosting up the Boards with moisture from room air. Some what avoidable... but back on subject.

Power Down and dry the PCs quickly, with warm to hot air. A hair dryer could help, just avoid too hot settings that can melt stuff.

I generally stick contaminated Lab Test Boards in a burn in oven set to LESS than 70c for several hours.
Caution: A home oven may not be well behaved, use a thermometer.

70c is the standard commercial IC operating maximum, but with the power off your IC can handle higher storage temperatues. The real limit will be the pLastic connectors etc.

Your pc Boards are likely to be an FR4 epoxy fiberglass, which is porous, like a sponge with microscopic holes. It should have the standard print coat moisture barrier, but check around the solder lands and you will see that the coverage is not 100%.

One of the worst things that could happen...
A milky white and very conductive substance forms around the solder joints and causes a short.
A little washing with a qtip (or antistatic brush) and 90% rubbing alcohol can clean it up.
BUT... this crap forms were water sits, like under connectors and sockets that you can't get to. Murphies law you know.

good luck