TL;DR
The paste is three parts baking soda to one part dish soap, thinned with water until it holds like frosting. It clings to a vertical surface, cushions the abrasion, and lifts tub rings and sink stains that a spray cannot touch. It is still an abrasive, so it stays off polished stone, glossy acrylic, and coated surfaces.
The Recipe
| Ingredient | Amount | Role |
|---|---|---|
| Baking soda | 1/2 cup | Mild abrasive that does the scouring |
| Dish soap | 2 to 3 tablespoons | Surfactant that lifts grease and holds the paste together |
| Water | A splash, as needed | Adjusts consistency |
Stir the baking soda and dish soap together first, then add water a teaspoon at a time until the paste holds its shape on a spoon. Too thin and it runs off a tub wall. Too thick and it drags instead of gliding.
Make it fresh. Baking soda paste dries out in a covered container within a few days, and there is no reason to store what takes ninety seconds to mix.
The Optional Brightening Version
For stains rather than soil, swap the water for hydrogen peroxide. Peroxide oxidizes pigment, which handles the yellowing and gray discoloration that abrasion alone does not touch. It is particularly good on white porcelain, white grout, and dingy tub surrounds.
Use it the same session you mix it and never store it in a sealed container, because the mixture releases oxygen and builds pressure. Test colored grout and colored fixtures first, since peroxide fades pigment. The details are in hydrogen peroxide for household cleaning.
What Soft Scrub Paste Is Good For
Paste works where a spray runs off and where a powder scatters. Sink basins, tub rings, shower floors, toilet exteriors, stovetop surrounds, and grout lines all hold paste long enough for it to do its work.
Good jobs for it:
- Tub rings and the soap film line on a shower wall
- Stainless steel and porcelain sink basins
- The area around burners on a stovetop, worked gently
- White grout lines that have gone gray
- Burnt residue inside an oven, worked with a plastic scraper
- Plastic outdoor furniture that has gone chalky
The chemistry is in what baking soda really does, and the short version is that abrasion does more of the work here than pH.
How to Scrub Without Scratching
Pressure is what causes damage, not the powder. Baking soda crystals crumble under load, which is exactly what makes them forgiving, but heavy pressure with a stiff pad defeats that.
Apply the paste and let it sit five to ten minutes before touching it. Dwell softens the soil so you need less force.
Use a soft applicator. Microfiber, a nylon sponge, or a soft brush. Never a scouring pad or steel wool with paste, because you have then stacked two abrasives.
Work in small circles with light pressure. If you find yourself leaning into it, the paste is not the right tool for that soil.
Rinse completely. Dried baking soda leaves a chalky white film that actually attracts new soil, which undoes the work.
Dry the surface. Water spots on a freshly scrubbed sink are avoidable.
Where This Paste Does Not Belong
| Surface | Why not |
|---|---|
| Polished marble, granite, travertine | Abrasion damages polish and sealer permanently |
| Engineered quartz | Resin bound, and abrasives dull the surface |
| Glossy acrylic and fiberglass tubs | Micro scratches that hold soil and dull the shine |
| Refinished or reglazed tubs | The coating is thin and abrasion cuts through it |
| Glass ceramic cooktops | Fine scratching, especially if the paste dries |
| Coated screens and displays | Damages the coating immediately |
| Nonstick cookware | Wears the coating off |
Acrylic and refinished tubs are the two most common casualties. Follow cleaning an acrylic tub without scratching it and cleaning a refinished tub safely instead, because a reglazed surface has only a thin coating between you and the old fixture.
Engineered stone deserves the same caution. Cleaning quartz countertops covers why abrasives, bleach, and high heat all damage the resin.
Test any glossy, coated, painted, or plated surface in a hidden spot first, and look at it in raking light afterward, since fine scratching is easy to miss straight on.
Safety Notes
Never add bleach to this paste. Dish products can contain ammonia compounds, and bleach plus ammonia releases chloramine gas. Do not add bleach to the peroxide version either.
Never add vinegar. Acid and baking soda neutralize each other into salty water and carbon dioxide, and you get a fizzy mess with less cleaning power than the paste had before.
Wear gloves if your hands are sensitive. Dish soap and repeated wet work dry skin quickly.
Rinse food contact surfaces thoroughly with clean water afterward.
This paste is not a disinfectant. It removes soil, which reduces germs by removal, but a surface that needs disinfecting after raw meat or illness needs a labeled product used for its full wet dwell time.
Source: US Environmental Protection Agency antimicrobial product registration guidance
FAQ
What is the ratio for homemade soft scrub?
Roughly three parts baking soda to one part dish soap, with water added a teaspoon at a time until the paste holds like frosting. Half a cup of baking soda to two or three tablespoons of dish soap makes enough for a sink and a tub. Mix it fresh each time.
Will baking soda paste scratch my bathtub?
On porcelain and enameled cast iron, generally no, if you use light pressure and a soft cloth. On acrylic, fiberglass, and refinished tubs, yes, it can leave fine scratches that dull the finish and hold soil. Test in a hidden spot and use a non abrasive cleaner on those materials.
Can I store homemade soft scrub?
Not usefully. Baking soda paste dries out within a few days even covered, and the peroxide version must never be stored in a sealed container because it releases oxygen and builds pressure. It takes under two minutes to mix, so make it fresh for each session.
Does soft scrub paste disinfect?
No. It removes soil and stains, which reduces germs by removal, but it carries no tested germ kill claim. If you need to disinfect a bathroom surface, clean it with the paste first, rinse, and then apply a product labeled for disinfection for its full wet dwell time.
Can I add vinegar to make it stronger?
No. Vinegar is an acid and baking soda is a base, so they neutralize each other into salty water and carbon dioxide. The fizz consumes both ingredients and leaves you with something weaker than the paste you started with. Use them separately if you need both.
What can I use instead on stone or quartz?
Warm water with a few drops of dish soap, or a cleaner labeled pH neutral and safe for stone. No abrasives, no acids, no bleach. For a stubborn spot on sealed stone, a longer soak with a damp cloth laid over it does more than any amount of scrubbing.
The whole-house equivalent of this routine is covered by house cleaning services.
Soft scrub paste is two pantry items and ninety seconds, and it handles the bathroom jobs that sprays cannot. Keep the pressure light and the paste off anything glossy, and it stays a safe tool. When a bathroom has years of buildup, a professional deep clean resets it faster than a weekend of scrubbing. Every home is different, so the real number depends on size, condition, and what you want covered. Get a quote and we will walk you through it.