I've 'saved' at least 2 laptops from 'written-off, post-spill incidents'. (In other words, revived eWaste laptops from obvious liquid damage.)
All I did was take a bottle of 91% Isopropyl Alcohol and a fresh soft-bristle toothbrush to the entire board, focusing on where there was clearly corrosion/residue. Don't be stingy w/ the alcohol, and do this outside or somewhere well-ventilated. (I did not, and later realized that I put myself at great risk for a fire, and got a bit light-headed. Oops)
On your board, since there's an LGA socket involved: I'd safely cover the socket before any 'work' on it.
Also, for the socket and impossible crevasses I'd highly recommend some
CRC QD Electronics Cleaner.
Aside note:
An ultrasonic cleaner filled w/ an electronics-compatible solvent like Isopropyl Rubbing Alcohol would be 'ideal'.
Big warning here though when you agitate and warm alcohol, it fumes heavily; those fumes become a fire/(minor) explosion risk! There are ways to mitigate the risk, but unless you're regularly cleaning boards, the complexity and costs aren't really worth it.
If you were to go that route, I'd be doing it outside, away from anything flammable, on a long extension cord.
(I'd also have to be willing to 'write-off' both the ultrasonic cleaner and board before attempting. Meaning, I'd treat this method as a last-resort after manual cleaning)
edit:
My $0.02 on post-waterwash 'drying'
A dehumidifier is a great thing to have around.
Just last week I spilled coffee in my cheapo goodwill-find Red Dragon mech KB. All I did was unplug the keyboard, take it to the kitchen sink, doused it in Dawn and took a big soft-bristle brush to the whole thing. Did about 5 'passes' of scrubbing @ angles and rinsing before a final rinse and setting the thing up on the exhaust of my dehumidifier.
Before the end of the day, I had my keyboard back on my desk, working. (Notice, that at no point did I even remove the keycaps. Top-tier laziness, but it worked out.)
Be aware:
most tap water is full of minerals and other 'ions' that can leave behind high-resistance shorts during drying. If I were to ever attempt a dishwasher-ing or a sink-cleaning of a board, GPU, etc. I'd be rinsing it in distilled water and again in alcohol before leaving to dry.