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Have a nice shirt with embarrassing yellow stains under the arms? Me too. I`m not a person who sweats heavy or have a problem with that but over time some of my shirts will tend to get those annoying & embarrassing marks. BUT I have two solutions for you to try. The first one is lemons, which I tried for the first time myself. I did it on two different shirts. Just take the juice of one lemon & put it in a spray bottle, or use a old toothbrush like I did, and spray the underarm stains. I let the juice sit for about 5-10 before washing it. You can let it sit linger if you desire. After normal washing/drying shirt came out nice & clean minus the yellow stains. YAY!
Another method you can try is with aspirin. Take 1-2 non coated aspirin pills & crush into a powder. Then add a little water until you form a slight paste texture, using a old toothbrush, brush the underarms & let it sit for awhile. Go ahead and wash like you normally would. The aspirin not only gets rid of the discoloration but also helps with deodorizing.