The Thing Under The Floor

I've discovered a whole world of black mould.  It's under my bathroom floorboards, in the interstices between my tanked cement floor, the polystyrene insulation, and the rotten boards proper.  I was expecting to find a sump of poo juice, so in a way this is a blessing; I may only have to re-floor the wet side of the room.  But I'm gonna have to do something about this colony of mould.  Bleach and dehydration, death from above.  Is that genocide?  Are all those little filamentous fellows going to yell "holy frack! it's ---aarhg!"?  Are millions of voices going to cry out in terror and be suddenly silenced?  Why am I even thinking junk like this - have they got their mycelial filaments into my brain? 

This is going to get very Lovecraft.  Only one answer: the Providence solution.