When I doused a motherboard with coolant, after switching the machine off, I rinsed it with isopropyl alcohol (try your chemist) to drive as much of the water out as possible. I then dried the board thoroughly with a hair dryer for several hours, and then left it for 24 hours in a very hot room.
Without heat, you would need to let that card dry for a good number of weeks since PCBs are pretty absorbent and water gets in underneath sm components and chips and just won't come out.
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