If you mean a laundry tip for making white clothes look brighter, a common household ingredient is baking soda. It can help remove odors and boost the cleaning effect of detergent, though it won’t magically turn every fabric “as white as milk.”
A simple method:
- Add ½ cup of baking soda to your washing machine along with your normal detergent.
- Wash with the hottest water that is safe for the fabric.
- Avoid mixing baking soda with chlorine bleach in the same wash.
For stubborn yellowing or stains, the best method depends on the fabric type (cotton, polyester, whites with prints, etc.).