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"And then high pitched squeals coming from the vents. And a smell of ammonia seeping into rooms that no air freshener could mask. When contractors opened the attic drywall, they uncovered hundreds of bats roosting in the insulation and their droppings saturating the wood and the walls. It was a nightmare of remediation. Workers in full respirators hauled out truckloads of contaminated insulation. The couple learned the odor came from guano that was piled so deep it ate through their drywall."
