Be aware, however, that while oxygen bleach is ideal for organic stains, it is not safe to use on coloured or delicate fabrics like silk or wool. As with any cleaning product, always follow the instructions on the packet, and test the bleach on a small and inconspicuous area first to be certain your fabric is robust enough.
- Mix up a pre-wash solution of 1-2 tablespoons of oxygen bleach powder in a gallon of water. For old or stubborn stains, an additional 2 tablespoons of powder may be added.
- Leave stained items to soak for up to an hour. Stubborn stains may be left to soak overnight in more dilute solutions.
- Wash garments as normal.
This should be effective for removing yellow armpit stains with a minimum of fuss and bother.
How to Remove Yellow Stains from Clothes with Baking Soda Paste
If your garment has not responded to a quality laundry detergent, and cannot be treated with bleach, the following method covers how to remove yellow sweat stains with a simple home remedy. Be aware that baking soda can be very abrasive, and you will still need to wear gloves – once again, you should test this method on a small, unnoticeable area first to be certain it is safe for your clothing.
- Mix baking powder with water until you have a thick paste.
- Apply the paste to the stain using a toothbrush or your gloved fingers, and leave for 20 minutes.
- Wash the garment on a cold cycle with a quality laundry detergent.
Your white shirts will be back to their original brightness in no time!