Can you explain how you use it? What does Oxyclean do to the rest of the shirt? I need more detail. I used Oxyclean for a while but have not used it in some time. Are you talking about yellowing on white shirts?
Yes, yellowing on white clothes under the arms and also on colored shirts too. I just follow the directions. Spray on the stained area, rub it in for 5-10 minutes and wash as usual. Sometimes, it takes more than one treatment. It will stain (looks like an oil stain) if you forget to wash it and let the oxi-clean dry after you spray it on. Unfortunately I have forgotten.