How many truckloads of bottled water will it take to wash down everything inside your house including the walls, ceilings and floors? How many will it take to wash down the outside and roof of your house? How many will it take to wash down the kids’ toys, the garage, the chicken coop (are your chickens alive today?), the dog house and the dog (is the dog alive?) and everything in the yard? That’s not even getting to how many years will it take to wash away the soil contamination.
No, you pray for rain to do the outside stuff.
There once was Army Navy surplus stores in many towns and cities. You could go in and buy yourself a gas mask, but few did as there wasn’t much use for them. I bet those people in Eastern Ohio would like to have a few for the phosgene gas that train wreck created!