Natural bioremediation has already kicked in (aka "natural attention"), just add food right? Problems will arise once metabolic wastes impair microbe viability. Usually you physically blend, turnover or somehow run exchange fluids through the material you are attempting to remediate. This means bull dozing the wetlands in a more direct approach. A lesser form might be to enhance exchange of fluids over the wetlands, again likely with mixed results. You need to physically disturb the layer of petroleum over roots, in soil and sediment to get oxygen in and wastes out. Washing alone through a wetland is unlikely to accomplish this.
Also, tar balls in saltwater enter a sort of stasis at least when compared to an oil layer. The exterior is resistant to evaporation, UV degradation and even effective consumption by microbes to a degree. Once you break them open through wave action, impact on shore features, heating, etc. fresh, fairly unweathered viscous oil is exposed all over again. The interior of the tar balls can have higher adhesion, send contaminants into solution more readily, cause more problems in general. There could be some promise in bioremediation alternatives to chemical dispersants currently being applied.
Some firms are BIG on promoting "designer bugs" bioengineered to consume particular contaminants. I have no doubt they would love to aerially bombard the impacted wetlands with their "bugs du jour." Trouble is the naturally occurring bugs are probably eating the stuff as fast as they can currently. They'll continue until build up of their waste stunts their populations. Same problem exists with designer bugs.
To my understanding in the context of this spill in wetlands, there are no magic bugs or automatic low impact and rapid bioremediation solutions. Lots of firms will tell you that their bugs are special and will make things all better on a stack of bibles. I've sure seen plenty of the pitches attesting to this over the decades. They doesn't mean there are some viable variants out there or new approaches that might help things. I would just caution against building excessive optimism about the effectiveness of bioremediation as a rapid, low impact and fairly easy cure all.
An AP article discusses some of the daunting realities at:
http://www.theadvertiser.com/article...-be-impossible
Bioremediation is being discussed, searching for "EPA bioremediation BP" yields about 53,000 hits.
http://www.google.com/search?client=...UTF-8&oe=UTF-8
The EPA even has a publication titled "GUIDELINES FOR THE BIOREMEDIATION OF MARINE SHORELINES
AND FRESHWATER WETLANDS".
http://www.epa.gov/oem/docs/oil/edu/bioremed.pdf
Mother nature will fix this, eventually (decades, longer?) but in what form it will eventually return to and the severity of intervening devastation and spinoff repercussions is a serious matter. We screwed up as a culture, as did our leadership and the petro industry. Now we pay the price, hope it isn't as steep as imagination indicates it could be.