If you mean a viral “baking soda removes very dark stains” cleaning tip, it can help with some stains, but it isn’t a universal solution.
A basic method
Mix baking soda with a little water to make a soft paste. Apply it gently, leave it for a few minutes, then wipe or rinse thoroughly. Test a hidden spot first.
⚠️ Baking soda is mildly abrasive, so avoid aggressive scrubbing on polished wood, natural stone, delicate fabrics, or glossy finishes. Never mix it with bleach or unknown cleaning chemicals.
If you tell me what the dark stain is on—wood, clothes, carpet, grout, teeth, or something else—I can give you the safest recipe for that surface.
