The rain will clean it up, at least the worst of it. I believe they are still trying to get a better handle on stopping the release. Like what was mentioned above, speak the language, work cheap, and have a CHP so you can be a consultant.
I would like go over and personally see how bad it is just to satisfy my own curiosity (like passing a bad car wreck), but their standards and culture are much different than ours and I don't believe I would care to actually work over there. I don't think workers are afforded the same rights in Japan as they are in the USA. I really think they are going to look in 3rd world countries for their labor on the clean up because workers from a country in turmoil will do the work and not complain as opposed to staying home in their tent and dodging bullets.