Radioactive!!

I had a strange dream last night, and what is even stranger is that I can still remember parts of it this late in the day!
I was in a very mountainous place, possibly in the future, which was heavily radioactive and everyone seemed to live and travel around in specially adapted Winnebagos, shielded from the radiation outside. They even had "air-locks" which could eradicate radiation on people to allow them in!
Somehow I blagged my way into one of these vehicles and found out that they occupants were very excited as the heavy rain outside meant that they were expecting flooding which, for some reason, would bring cleansing water, or some other special liquid, up to the surface to absorb and eradicate most of the radiation in the environment.
Unfortunately I woke up before I was able to find out exactly how this was to be achieved!
I wish I had more dreams like this.