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Almost everyone has been surprised to open the dryer and find clothes smelling musty—like a dirty rag—even after a full wash and dry. Pouring in expensive detergent or relying on heavily scented fabric softener only masks the odor for a little while; the sour, persistent smell returns as soon as garments become damp or sweaty. The good news: you don’t have to keep fighting your laundry.
The secret to easier, more effective laundry is surprisingly simple. Instead of studying complicated wash cycles or buying pricey specialty detergents, try two budget-friendly items you can find easily: washing soda and citric acid.
How to use washing soda and citric acid
When laundry smells bad, people often reach for more heavily scented fabric softener. That’s a temporary cover-up, not a fix. The real culprits behind the sour odor are body oils (sebum) and bacteria.
Regular detergents don’t always remove the stubborn oils lodged deep in fabric. Those oil residues feed bacteria, and in humid conditions—when clothes dry slowly—bacteria multiply rapidly and release foul gases. To get rid of the odor for good, you need to break down the oils completely and make conditions inhospitable to bacterial growth, not just add more fragrance.
The most powerful tool here is washing soda. It’s more than ten times as effective at removing soils as common baking soda. The method is straightforward: cut your usual detergent amount in half and add about 20–30 grams of washing soda (roughly 1.5–2 tablespoons, or 0.7–1.1 ounces) to the wash.
Washing soda alters the water’s chemistry so dirt lifts more easily and dissolves protein- and oil-based soils that cling to fibers, allowing them to rinse away. Because it’s highly active, avoid using washing soda on delicate fabrics such as wool or silk. To prevent gritty residue, dissolve the powder in warm water before adding it to the machine.
If washing soda tackles the grime, citric acid handles the finish. Fill a spare container halfway with citric acid powder, top it with warm water, and stir to make an all-purpose citric acid solution. Add a cup or two of that solution to the fabric softener compartment to neutralize lingering sour odors.
Most detergents are alkaline; citric acid neutralizes that alkalinity, softens textiles, and has a mild sanitizing effect that helps prevent bacterial regrowth. For garments with especially stubborn odors, pre-soak them in a citric acid solution for about 30 minutes before washing to remove smells and prevent odor transfer to other items.
Finally, keep the laundry environment clean. No method will work reliably if the machine itself is dirty. Once a month, add 500 g of washing soda (about 1.1 lb) to the drum and run a tub-clean cycle with hot water. After each wash, leave the machine door and detergent drawer open so the interior can dry fully and mold can’t take hold.
When drying clothes, space items apart and use a fan to speed evaporation. To prevent sour smells, reduce use of fabric softener—which can leave a thin, oily film on towels and underwear that becomes a bacterial haven—and choose citric acid instead. It’s a practical and economical solution.
How to use washing soda around the house
Washing soda’s strong alkalinity makes it excellent for removing ground-in grime throughout the home, not just in the laundry room.
Start in the kitchen: it’s effective on grease and range-hood filters. The sticky residue that builds up is made of oxidized fats; washing soda breaks down those fats and converts them into water-soluble, soap-like substances.
Make a solution by dissolving 5 g of washing soda (about 1 teaspoon) in 500 mL (about 17 fl oz) of warm water (40–50°C / 104–122°F) and put it in a spray bottle. For heavily soiled range-hood filters, place the filter in a large plastic bag, pour in hot water with dissolved washing soda, and let it soak for 20–30 minutes; a quick scrub with a toothbrush will remove the sticky grease. Spray the solution on walls or countertops around the stove, wait about five minutes, then wipe to restore a smooth surface.
You can also revive scorched pots and pans without harsh scrubbing. Fill the pan with enough water to cover the burnt area, add 1–2 tablespoons of washing soda, and simmer over low heat. As the water heats, burnt residues will start to break apart and float up.
Washing soda loosens the bonds in charred protein- and carbohydrate-based residues. Turn off the heat, let the water cool, and wipe the pan with a soft sponge to restore it. This method works on stainless steel, enamel, and glass cookware.
Washing soda is also useful for bathroom and sink drains. Bad odors and fruit flies often stem from a biofilm of microbes lining the pipes. That film resists ordinary detergents but is vulnerable to strong alkali like washing soda.
Remove surface moisture around the drain and sprinkle a generous half cup of washing soda powder. Slowly pour very hot water (above 60°C / 140°F) over the powder so it dissolves and helps dissolve microbial proteins on the pipe walls. The heat and alkaline reaction also break down hair oils and trapped debris, cutting off the source of foul smells.
Use washing soda for white sportswear and stubborn yellowing too. Sweat stains and yellowed shirt collars are often resistant to standard detergent. Washing soda is essentially the active component of oxygen bleach without hydrogen peroxide, so it has strong cleaning power.
Make a concentrated washing-soda solution in warm water, apply it to collars or cuffs, and let it sit about 10 minutes. Rub gently, then launder as usual—the fatty residues that cause yellowing will dissolve and your whites will return. Boiling aprons or dishcloths in washing-soda water will both deodorize and sanitize them.
You can even clean living-room surfaces and furniture. Wiping greasy doorknobs, light-switch plates, or ground-in dirt on floors with a cloth dampened in washing-soda solution will dissolve oils and dust quickly. But avoid direct contact with materials such as aluminum, copper, leather, or unfinished wood—washing soda can cause discoloration or corrosion on those surfaces.
Washing soda can also break down skin proteins, so always wear rubber gloves when using it at home to minimize skin exposure. If you use the solution in a spray bottle, work in a well-ventilated area to avoid inhaling any fine particles.
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