Well,
here's the MSDS - that's some pretty nasty stuff. It also kills the ozone layer, for all you tree-huggers out there.
Here's a
safety sheet from Australia - methyl bromide was supposed to be phased out in 2005, although it seems it's still exempt for quarrantine situations such as yours.
There won't be much need for cleanup, however:
Exposure to soil residues after fumigation is unlikely to cause health effects as methyl bromide quickly evaporates at normal temperatures....
... And from
another site:
Methyl bromide is a colorless gas at room temperature and a liquid below 38.5ºF (3.6ºC) or when compressed. It is usually shipped as a liquefied, compressed gas. It is odorless and nonirritating at low concentrations and has a musty or fruity odor at high concentrations (greater than 1,000 ppm). Because methyl bromide lacks adequate physiologic warning properties, up to 2% chloropicrin, a lacrimator, is often added to prevent significant exposure.
Most exposures occur by inhalation and by absorption through the skin. Odor is not an adequate indicator of the presence of pure methyl bromide and does not provide reliable warning of hazardous concentrations. Because pure methyl bromide lacks adequate warning properties, significant exposure can occur before symptoms are evident.
Methyl bromide is 3 times heavier than air and can accumulate in poorly ventilated or low-lying areas. Under adverse conditions, it can remain in the air for days after application as a fumigant. Fatalities have occurred among pesticide appliers and building occupants who were exposed during the application process or who prematurely reentered fumigated buildings.
Methyl bromide reacts with strong oxidizers, magnesium, aluminum, tin, zinc, and alloys. It attacks aluminum to form aluminum trimethyl, which is spontaneously flammable.
Given that it settles in low-lying areas, I'd recommed that you very thoroughly ventilate the boat for several days, with fans or other such devices. You might put a long vacuum hose down in the bilges and have the vacuum above decks so you can suck out any remaining gas.
Washing down won't do much good, since the stuff evaoprates at around 39º F (4º C).
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