7 Things You Should Never Store Under the Sink (But You Probably Do)

The cabinet under your sink might feel like the catch-all for everything—cleaners, sponges, random extras—but it’s one of the riskiest spots in the house for storage. Between the moisture, low airflow, and risk of leaks, plenty of everyday items can get ruined down there—or cause bigger problems.

If you’ve been tossing stuff under the sink without thinking twice, here are a few things to move elsewhere starting today.

Paper Products

Toilet paper, paper towels, napkins, and even cardboard packaging don’t belong under the sink. If a small leak happens, they’ll soak it up fast and turn into a moldy mess before you even notice.

Even high humidity from dishwasher steam or a warm summer day can make paper products go limp or musty. Store these items in a dry, ventilated spot instead.

Extra Cleaning Wipes

Those big bulk containers of disinfecting wipes can dry out if they’re stored somewhere that gets too warm or humid. The under-sink cabinet tends to trap heat, especially if it’s next to a dishwasher or oven.

Once those wipes dry out, they’re useless—and pricey to replace. Keep unopened extras in a pantry or hall closet where the temperature stays more stable.

Batteries

Batteries and moisture don’t mix. Even a little humidity can lead to corrosion, and that white crusty stuff you see on old batteries? That’s leaking chemical residue.

If you keep batteries on hand for remotes, flashlights, or toys, stash them in a drawer or container that stays cool and dry. A plastic bin on a high shelf is a much safer bet.

Paint or Stain

Small leftover cans or jars of paint might seem like a smart fit under the sink, but the temperature swings down there can ruin the contents fast. Heat can cause separation or drying, while cold can make it too thick to use.

Paint should always be stored somewhere climate-controlled—like a garage shelf if it doesn’t freeze, or a utility room cabinet indoors.

Small Electronics

Old chargers, kitchen gadgets, or even nightlights shouldn’t be shoved under the sink. Moisture can corrode the metal parts or damage the internal wiring without much warning.

If you’re saving these for later use, pack them into a lidded plastic bin and store them somewhere dry. Keeping electronics in a damp cabinet is asking for trouble.

Pet Food

Pet food might be sealed, but the under-sink environment can still lead to spoilage. Heat and humidity speed up the breakdown of fats in the food, leading to off smells or a change in taste.

It can also attract pests. Ants and mice love dog kibble, even in a sealed container. A pantry shelf or closed closet is a better long-term storage option.

Extra Sponges or Scrub Pads

You’d think it’s fine to stash these under the sink—but they soak up humidity like crazy. Even unopened, sponges can grow mildew if they sit in a warm, damp area too long.

If your backup stash starts smelling funky before you even use it, that’s why. Keep extras in a dry drawer or linen cabinet instead, and grab them as needed.

*This article was developed with AI-powered tools and has been carefully reviewed by our editors.