This wasn't super easy, as Laundry Sauce's fragrances are incredibly specific, but after some research, I found a reasonable option in Downy Infusions Sparkling Amber and Rose fabric softener ...

Of the four sweaty shirts I washed with this Downy laundry additive, three came out without a hint of underarm odor. The fourth shirt? I had to wash it again. However, in the end, it came out with ...