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Nothing spoils the look of your button-down shirt more than a yellowish-tinged collar. Sweat, body oil and even some lotions and creams can contribute to a stained shirt collar. Once the ring is there, a quick wash-n-dry won't make it go away, no matter how hard you try, because the soiling is embedded in the fabric. Rather than wearing a tainted shirt, attack ring-around-the-collar stains with some common household ingredients that can work wonders.
Put 4 tbsp. of baking soda and 1/4 cup of warm water in a small container. Stir with a spoon to create a paste.
Slather the baking soda paste directly onto the stained area of the shirt collar with the spoon. Allow the paste to remain on the shirt for two hours.
Hold the shirt over a sink, or the washing machine, and pour 1 tsp. of white vinegar onto the paste to soften it.
Scrub the paste with an old toothbrush to work it down into the fibers of the garment. Launder as directed on the shirt's care label.
If you don't have an old toothbrush, use your knuckles to work the paste down into the fabric.
As an alternative, wet a bar of heavy-duty laundry bar soap and rub the soap into the ring-around-the-collar stain. Allow the soap to remain on the stain for at least five minutes before laundering.
Check the shirt collar to see if the stain was removed before drying the shirt.