Got light-colored clothes turning gray? As someone who's relied on this trick for years, baking soda is your go-to for whitening laundry.
It's my surefire way—passed down from my grandmother—to make whites look brand new.
Here's her reliable technique to restore brightness and banish yellowing:

1. Load white t-shirts, sheets, and sports socks into the washing machine.
2. Run your usual wash cycle.
3. During the final rinse, add 300 g of baking soda to the detergent drawer.

Your laundry regains its full whiteness! :-)
The improvement is immediate—my whites were nearly pristine after one cycle.
Now you have a simple, expert-approved way to whiten clothes with baking soda.
Perfect for erasing gray from white linens, brightening kimonos, fine lingerie, or bedsheets.
Though results shine after the first wash, I repeat with extra baking soda on the next load for the same items.
The brightness lasts months before needing a refresh.
Supermarket whiteners run 6-10€; baking soda costs around 5€ for 1 kg—more value for less!