What location provides a dark, damp breeding zone shielded from evaporation near plumbing connections?

Answer

Behind wall-mounted sinks or under floors where a slow leak persists

A persistent infestation might stem from the dark, continuously damp zone of rotting organic scum around pipe connections or under floors where slow leaks have occurred.

What location provides a dark, damp breeding zone shielded from evaporation near plumbing connections?
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