OP you are correct. The British with some help from HHS did a study and found removing clothes gets like 80-90% of contamination off, wiping down with a towel gets that up to 99%.

https://homelandprepnews.com/counter...-contaminants/

Decontamination is the number one priority and getting naked is the first step. Water is good, but you need some soap to decrease the surface tension of the liquid agent to get it off of your skin (think you hands after making a hamburger patty). Baby shampoo is what most teams use, but any soap, like Dawn, will work well. Most Nerve Agents are liquid and rarely are a gas, they are aerosolized as others have said, but they technically remain a liquid.

From a self protection standpoint if you are ever needing decontamination a gym with pool and shower are good choices. Next best choice a building fire sprinkler system. Break the glass bulb or metal plate and water will flow. It may be nasty water at first, but probably better than that nerve agent on you.

Signs and symptoms of nerve agent exposure are:
Salivation - Drool
Lacrimation - Tears
Urination - Pee
Defication - Poo
GI Pain - Tummy hurts
Emesis - Puke
Miosis - Pinpoint Pupils

You will also see Runny Nose and Bronchospasm. Ultimately you will die from a respiratory cause. Not sure if many are still out there on YouTube (guns bad but death by Sarin is ok), but I have a bunch of videos from the first two Sarin attacks in Syria and they demonstrate these signs and symptoms.

Treatment is airway and breathing. Atropine to treat the Cholinergic Effects (the signs and symptoms) and Pralidoxime Chloride (2-PAM) to remove the nerve agent from the Acetylcholinesterase (true antidote).

I have offered in the past, but if people are interested in a class, I can offer one up. Full on Hazmat/WMD class, even let you play with some radioactive isotopes and a radiation detector and put you in some PPE. Show you a MARK I Nerve Agent Antidote Kit (NAAK) and a DuoDote NAAK and how they work.