I do this all the time for stains on white clothing. Take an old toothbrush and put a little Softscrub with Bleach and rub it on the area. If it doesn't go away right away, then leave it on for a few minutes. Don't make the tooth brush very wet to keep the softscrub from running into a colored area (if it's close to the stain).
Then after sitting awhile or rubbing it with the brush, I take the water spray hose from my kitchen sink and spray the softscrub thoroughly off of the garment, spraying it away from any colored section of the article of clothing.
If this is the first time or two that you do it, then I would wash the whole garment right away just in case there are some "remnants" of softscrub somewhere on the article of clothing.
Pour the softscrub on the kitchen counter first and then just jab a very small amount at a time onto the brush before you start scrubbing.
I used this on anything that is white such as stain on a tennis shoe or purse also.
M. W.