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How can i sort out the mould growing on the sealent around my windows?

I had my windows replaced in febuary this year the problem is the sealent around nearly all of the units have mould on them which will not come off with anything i have used, i would like to know what has caused this and how to sort it out please.
helen, November 2009
50%bleach/50%water and an old toothbrush

emily, December 2009