@gustavratzenhofer,
Not a solution - actually a suspension (chemistry nerd humor)
Dispersant is a contributor to another added problem. Toxicity of the dispersant -- perhaps even an airborne problem to anyone inhaling it.
So what happens to this waste oil if the tarballs etc. sink to the bottom or spread out further? There's still tens of millions of gallons of oil sitting in the ecosystem - waiting. Clearly dispersed doesn't mean removed. How do the ocean beds and micro-plankton get restored with with either the oil or the dispersant polluting them?
The dispersant is also toxic. It might take one good FL coast hurricane and the oil then spread and is lifted airborne, beyond Orlando FL, which is a considerable distance inland. This lifting was the case with Katrina and Hurricane Charlie the killer hurricane
http://en.wikipedia.org/wiki/Hurricane_Charley
which destroyed 50-80% of Punta Gorda and Port Charlotte FL. about 6 yrs ago (damage cost was $15-17b) and killed (directly or indirectly) 30 people in US .