Originally Posted by VMan
Haha, J, I'll type it up for ya:
Step 1: Soak shirt in a solution made from one gallon hot water (as hot as it will come out of the faucet) and one cup of vinegar. Let the shirt soak for 30 mins to 2 hours.
Step 2: Rinse shirts, and squeeze out excess water. Empty bucket and rinse. In a cup, prepare a concentrated Oxy-Clean solution. Make sure to use the Oxy-Clean granules that come in the tub. Make the solution about 10 parts HOT water to one part O-C. Usually this amounts to two scoops of O-C (using the provided scoop) per 4-6 ounces of water. You want this to be very concentrated.
Step 3: Apply the strong solution generously to the stained areas. Place the shirts in a bucket (so that the solution doesn't flow away, or dry) with the stained areas towards the bottom of the bucket so they stay nice and covered in the solution. Allow to soak overnight. It can also help to use an old toothbrush and scrub the stained areas every hour or so, if you've got the time.
Step 4: In the morning, remove the shirts from bucket. Fill the bucket with a gallon of hot water, and two scoops of the Oxy-Clean (basically, follow the recipe on the package for a general cleaning solution) and mix well. Place the shirts in the bucket, and soak for 2-24 hours. This just helps to remove any trace of stain. You might want to stir the shirts around with your hands after you put them in the bucket with the weaker solution just to remove some of the stronger solution that is still on the shirts.
Step 5: Remove, and wash/rinse in the regular cycle on your washing machine.
Note: I find that this normally removes sweat/dirt stains from the armpit, neck, and cuff with ease. For really strong stains, you might have to repeat the process a few times. However, with this, I've been able to remove some major sweat stains that have been set into shirts for five years, at least.
This thread is old, but I can't resist to not giving my praise here. This method is amazing.
I have a couple of shirts that are so dirty (specially the collar rings) with permanent stains which went through many washing/ironing, that I don't want to wear anymore sit in the closet (I didn't throw them away since they were from mom). I tried above method on them, and I am telling you, my shirts now look amazingly new. I am going to wear them this weekend
. I wish I took some before/after picture. But anyway, I am happy now.