“I’m expanding!” the vinegar laughed, its acid protons latching onto the carbonate ions of the baking soda.

The drain groaned. Then it coughed. A dark, foul wisp of old water burbled up, followed by a clean, volcanic foam. For the first time in months, the drain felt the kiss of moving air.

One was plain white vinegar, sharp and clear. It was a minimalist, an ascetic who believed in the purity of acid. “I dissolve the lies of limescale,” it often whispered to the baking soda box beside it. “I strip away pretense.”

“We’re dancing!” the baking soda cried, its structure breaking apart into water, salt, and that furious, joyful gas.

Then the drain .

After ten minutes, the woman ran the hot water. A torrent of clean, steaming liquid rushed down, washing away the spent foam, the loosened muck, the dead.

First, she poured the baking soda. Half a cup. It fell like dry snow into the dark maw of the drain, settling on the soggy, matted hair and the greasy biofilm. The drain shivered. It felt… grainy. Strange.