Stubborn Clothes' Stains

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I started washing my clothes this morning at around 6:30. That was the first thing I did after waking up. First, I washed those whites then I had to soak my other clothes. I knew I will have a hard time washing those because they were too dirty because they were inside the cabinet for too long and others already had yellow stains and dust stains (is it dust or smoke?). I tried to google how to remove those stains and was able to get some advice to use dishwashing liquid and vinegar. It was effective in removing the stains from dust but some of the clothes with yellow stains still have them even after washing. I use some of those clothes in going out but then, I will just make use of them inside the house now that they have stains. I might as well throw my older clothes and use these other clothes. I finished washing at around five in the afternoon. Our clothes line is full so I had to remove those that are already dry so that my other clothes will also dry up. How do you remove yellow stains from clothes? Do you have a secret formula?