I added up what I spent on cleaning products one year and the number was embarrassing. Fifteen dollars a month on various sprays and solutions that were mostly water with a tiny amount of active ingredient. Then my mother-in-law, who cleans houses for a living, showed me her spray bottle. It had exactly three ingredients and cost maybe forty cents to refill.

The basic formula

Fill a spray bottle with one part white vinegar to one part water. Add a few drops of dish soap. That is it. That is the cleaner that replaces half the bottles under your sink. The vinegar dissolves grease and hard water stains, cuts through soap scum, and kills most common household bacteria. The dish soap helps it cling to vertical surfaces instead of running off immediately.

It works on: countertops, stovetops, sinks, bathroom surfaces, mirrors, windows, and most flooring. Do not use it on natural stone (granite, marble) because the acid in vinegar etches the surface over time. Also avoid unsealed wood and cast iron which will absorb the vinegar smell.

Variations for tough jobs

For soap scum and hard water buildup in the shower, heat the vinegar first. Warm vinegar cuts through mineral deposits much faster than cold. Microwave it for thirty seconds, pour into the spray bottle with the water and soap, and spray on shower doors and fixtures. Let it sit five minutes, then wipe. The grime lifts off without scrubbing.

For greasy kitchen surfaces like the range hood or cabinet fronts near the stove, add an extra squirt of dish soap. The soap emulsifies grease. For mold and mildew in bathrooms, skip the vinegar and use hydrogen peroxide in a spray bottle. It kills mold spores and does not produce the bleach smell that lingers for hours.

The cost breakdown

A gallon of white vinegar costs about three dollars and makes roughly sixteen bottles of all-purpose cleaner. A bottle of dish soap lasts months when you are using a few drops per batch. The spray bottle itself costs a dollar at any dollar store and can be refilled indefinitely.

Compare that to four to six dollars per bottle of commercial all-purpose cleaner, plus the specialized bathroom cleaner, kitchen cleaner, and glass cleaner that are chemically very similar. You are paying for packaging, marketing, and water. The active cleaning agents are nearly identical.