How to Make Homemade Dishwasher Detergent | DIY Dish Soap

The promise of skipping store-bought detergent and its price tag is tempting, but getting homemade dishwasher detergent right takes more than mixing baking soda and calling it done. The real trick is balancing the right dry ingredients so your dishes come out clean, your machine isn’t coated in residue, and you don’t end up re-running the cycle. Here is exactly what goes into a working homemade detergent and how to store and use it without creating a bigger chore.

Ingredients and Ratios That Actually Work

The basic formula relies on four ingredients that handle cleaning, degreasing, stain removal, and water softening. Washing soda (sodium carbonate) is the heavy lifter for cutting grease. Borax boosts cleaning power and helps break down food soils. Citric acid tackles hard water spots and mineral buildup. Coarse salt helps soften the water and can boost the detergent’s performance in hard-water areas.

The most common ratio, from sources like The Spruce and HGTV, is roughly equal parts washing soda and borax with smaller amounts of citric acid and salt. A typical recipe calls for 1 cup washing soda, 1 cup borax, ½ cup powdered citric acid, and ¼ to ½ cup kosher salt. Some recipes swap baking soda for washing soda, but baking soda is only half as alkaline and won’t clean as well on its own — if you use it, you must first bake it at 400°F for one hour to convert it into washing soda.

Step-by-Step Mixing and Dosing

The process is simpler than the ingredient list looks. Combine all dry ingredients in a large bowl and whisk until evenly blended. A few pulses in a food processor help break up any clumps and ensure the citric acid is distributed evenly. Store the mix in an airtight glass jar or sealed container, labeled clearly, in a cool dry place — moisture causes clumping and kills the powder’s shelf life.

Start dosing at 1 tablespoon per load for normal cycles. For hard water or heavily soiled dishes, increase to 2 tablespoons, but don’t exceed that — overdosing can leave a cloudy film on dishes and stress the dishwasher’s drain system. High-efficiency dishwashers may require even less; start at 1 tablespoon and adjust downward if you see suds or residue. If you consistently need more than 2 tablespoons, hard water may be the issue and you should add a separate rinse aid or increase the citric acid proportion slightly.

How to Make Homemade Dishwasher Tablets

Tablets are the same recipe turned into solid form, which can be more convenient than scooping powder. After mixing the dry ingredients, add ½ cup lemon juice or water gradually while stirring until the mixture feels like damp sand — it should hold together when squeezed but not be wet. Pack the damp mix firmly into silicone ice cube trays or small molds, press down hard to remove air pockets, then let them dry uncovered for 24 to 48 hours until fully hard. Store the finished tablets in an airtight container with a silica gel packet if you have one, and use one tablet per load. The drying time is the most commonly skipped step — if you use them too early, they dissolve too fast and don’t clean effectively.

What Not to Do and Safety Notes

Never add liquid dish soap to a homemade dishwasher detergent recipe. Liquid dish soap creates a massive suds-overload that can damage the dishwasher’s seals, flood your kitchen, or void the warranty. The recipes that include lemon juice or vinegar use them in the tablet form only, and even then sparingly. Vinegar works well as a rinse-aid additive in the machine’s designated compartment, not as a main detergent ingredient.

Borax is a household cleaner, not a food ingredient. Keep the mix away from children and pets. Citric acid is acidic, so avoid direct skin contact when handling the powder. If you have hard water and need a stronger detergent, consider checking out our curated list of top-rated all-natural dishwasher detergents for tested options that handle tough mineral buildup without the guesswork.

Common mistakes are easy to avoid. Using baking soda instead of washing soda when the recipe specifically calls for washing soda is the most frequent error — it simply doesn’t clean as well. Storing the mix in a damp container or sealing it before it is fully dry causes clumping. Using too much detergent, especially in softer water, leaves a residue. The first-timer rule: start at 1 tablespoon and test a cycle before adjusting.