There are two different tricks to brighten those whites using different items.

I think these are great laundry tips to keep in mind for the future when I wash my whites.

The other option would be adding 3/4 cup of baking soda to the bottom of the washing machine.

How To Brighten Whites Naturally - DIY Brighten Whites - Laundry Hacks

Image by Andrea Jean Cleaning via YouTube

Then, add any of your whites into the machine.

This helps with the stain-fighting process better.

I usually wash my whites by spraying on Shout or using Oxi-Clean with laundry detergent.

Miracle Laundry No Bleach Required To Whiten Clothes - Learn how To Whiten Whites

Easy Ways To Brighten Whites- No Bleach To Whiten Whites