The "black mold" that is common in houses here is actually a harmless slime mold. It commonly grows wherever there is condensation, so in bathrooms and also windowledges etc where we get condensation when it's cold. They are easily cleaned up with either vinegar or soda - can't tolerate pH extremes - but the real solution is to get rid of the moisture which they need to live.
In other black molds, Aspergillus is a bad kind. They can be quite toxic. Rockporter is right, to know what you're dealing with and suit up for a hazardous job. You don't want to breathe the spores.
I've also read that bleach is not a best choice for hazardous molds. In the long run it kills off harmless stuff but encourages the more toxic and resistant types to take hold.
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