It’s well known that shits collars absorb the sweat immediately and get that yellowish aspect. Often, those sweat stains from shirts collars are hard to removed, and the laundry detergent isn’t enough to get rid of them. And bleach isn’t an option for that! The great news is that you can use 3 effective solutions that can remove those disgusting sweat stains out of collars.
To clean those yellow stains from shirt collars, you have to hand wash them before putting them in the washing machine.
Leave your shirt to soak for half an hour in lukewarm water and then put a few drops of shampoo over the collar. Gently rub it with a toothbrush, rinse it with cold water, and you will see that it is much cleaner, and the stains are gone. Then you can put the shirt in the washing machine, and wash it like usual.
Soak the dirty collars in freshly squeezed lemon juice and let it act for 15 minutes. Then rinse the collars with warm water and put a few drops of liquid dish detergent to degrease them very well. Rub softly with a soft toothbrush to get rid of the dirt.
Soak well the stained collar in hot water, and sprinkle a consistent layer of baking soda over it. Wait for half an hour so that the baking soda to degrease the sweat stains and to eliminate the salt from the fabric (sweat contains a lot of salt). You will see how those ugly sweat stains will disappear from the collar.