The ingredient you’re looking for is baking soda (sodium bicarbonate) or sometimes washing soda (sodium carbonate). Both are natural, gentle whiteners that brighten fabrics without harsh chemicals.
Here’s how it works:
- Baking soda: Add ½ cup to your regular laundry detergent to remove odors and brighten whites.
- Washing soda: More powerful than baking soda, it helps lift stains and soften water, making whites look purer.
For an extra whitening boost, you can also combine with a little lemon juice or sun drying, which naturally brightens fabrics.
If you want, I can give a step-by-step “milk-white laundry” recipe using only common kitchen ingredients. Do you want me to do that?