Yes, you need detergent. But to boost whiteness, add a bluing agent—a weirdly-named liquid that makes whites look “icebox fresh.” Laundromat pros have used bluing since the 1800s; it’s basically optical illusion magic in a bottle.
Alternatively, drop a quarter cup of baking soda into the wash. It neutralizes odors and brightens like a cheap, odor-free superhero. Your armpits will thank you (even if they’re silent about it).
