This is a wonderful life-hack for those problem stains you have on your favorite shirt and yet you still want to save them.
I am not sure with the Dawn dishwashing liquid because obviously we don't have that with the rest of the world. But I think any dishwashing soap will do. Then there is hydrogen peroxide (agua oxinada) and some baking soda.
Haven't tried it but will soon as I do my laundry these days.