I used a old toothbrush to scrub the mixture into the shirt.
As you can see in the pictures on the left the armpits had more of a grey color stain probably because they had been washed and washed and stains were left in there. I was wondering since the
stains were kinda old if this would even work. So after scrubbing with the toothbrush I let it sit for about an hour then washed as usual.
And TA DA.......
I found this great solution on the blog One Good Think by Jillee.