There is much more that needs to be done to achieve a good result. Often, a lot of time is wasted, thousands of chemicals are used , which in the long run ruin the clothes and weaken the fibres. The end result is that the clothes are torn and unusable. However, despite everything, the yellow sweat stains always remain .
Yellow sweat stains, how to remove them permanently
Yellow sweat stains are annoying and unsightly and give the impression of poor cleaning. Instead of ruining your clothes with unsuitable products, or standing there scrubbing and wasting time unnecessarily, you can use effective methods that don’t take a minute and don’t require the slightest effort.

The following remedy requires a maximum of 5 minutes, no effort, just a lot of patience. It is a solution that can be prepared in a short time and can be applied to towels, T-shirts, sheets and tablecloths. The clothes do not run the risk of being damaged by the solution or by yellow marks. In fact, they will be as good as new.
What causes rings and spots?
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.

What will come out is a dense foam that can be applied directly to the yellow sweat stains. Rub it in for a few seconds and then leave it to act for 20 minutes or half an hour at most. Once the required time has passed, put it in the washing machine and then start washing at 30, 40 degrees at most. The end result will be spectacular, the clothes will be very white, they will be like new again, clean and with an enviable aroma.