Yellow stains are not only the result of sweat not being removed properly, they can also be caused by poor storage of clothes or overly aggressive deodorants. In any case, whatever the cause, detergents are unlikely to be able to remove stains or marks permanently.

So, if you want to get a good result, you need to be patient and try again and again. Here is the alternative solution, certainly economical, that is most suitable for your goal.
The excellent solution to yellow sweat stains.
To prepare the miracle solution , combine 30 g of sodium percarbonate, 20 ml of water, 15 ml of liquid laundry detergent, 70 ml of carbonate. Mix everything together, the solution obtained can be used immediately as is, or you can let it sit for just half an hour to obtain an excellent result.
