So all Kim Jong-Nam had to do to survive was walk into a washroom and wipe his face clean with soap and water?
In reality atropine and pralidoxime(antidote sorta) administration would have most likely saved him, but it would be very unlikely for a medical professional to deduce that the threat was cholinesterase inhibition(nerve agent poisoning).
To use a very clumsy analogy, imagine nerve agents like VX are slamming on the brakes of your body. Atropine makes your body less sensitive to the effect of "brakes". 2-PAM takes the foot off the brake.
Wouldn't have hurt, though...