Some of the babies' mothers say the delivery room was dirty and trash littered the hallways.

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Platero's supervisors testified he came to them twice hours before the shootings to complain that his roommates were letting their room get too dirty.

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"The lawn needs to be watered, the cat box is stinky, there are dirty socks in the living room, silverware in the grass out back, and I can't get those children to get to bed at 7:30 no matter how hard I try, " he says.

WSJ: When the Wife Is the Breadwinner

She left the room, threw the dirty sheet in the laundry chute, and got a clean gown and fresh bedding from the supply closet.

NEWYORKER: The Visitor

She and I locked eyes across a crowded room that smelled faintly of dirty diapers and bubble mixture.

CNN: A kind of courtship: Finding a mom friend in the big city

Consider this: In a clean room, the couch never gets dirty.

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More fascinating, less dirty - Dyson now engineers motors in a room so clean no pollutants, pollen or dirt can damage the finely tuned technology being made by the highly calibrated production line.

BBC: Technology