How to remove White Piping stains on Navy track pants?

I have navy blue Adidas track pants ( 3 stripe )
And the stripes have gone and even colour of
brownish/yellowish and white!

First, try using a commercial stain remover directly on the stripes and launder. If that doesn't work, put color-safe bleach on the stripes and launder. If that doesn't work, try soaking your pants overnight in a solution of 1 tablespoon dish detergent (the type you put in your dishwasher) and 1 gallon warm water. If that still doesn't work, try using a bleach pen or chlorine bleach on a cotton swab and rinse immediately in at least five gallons of water. (It's so easy to bleach out the navy or make holes in your clothes with bleach, which is why I recommend it last.)

Remember, don't dry your pants in the dryer until the stain's gone because the heat from the dryer may set the stains in permanently.

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