How to Remove Cuff and Collar Stains From Dress Shirts

Underarm Stains

While sweat can cause some discoloration in your shirts, most of the yellowing is the result of a chemical reaction between the salts in your sweat and the aluminum compounds found in antiperspirants. No matter the cause, removing the stain is the goal. The following technique is quick, easy, and can be performed with household items:

Apply a mixture of one part dish soap and two parts hydrogen peroxide to the stain.
For stubborn stains, you can sprinkle some baking soda on top, this provides a bit of abrasion that helps with scrubbing.
Use a toothbrush or laundry brush to scrub the solution into the stain.
Allow to rest for  one hour.
Wash your shirt as normal.
Note: The above method works best with white cotton dress shirts. Hydrogen peroxide may lightly bleach some colored shirts. Always follow the advice on the tag of the shirt.

From The Collar

Collar stains are caused by a combination of sweat, dead skin cells, oil, and residue from hair products.

Lay your shirt flat with the soiled collar facing up.
Pour undiluted liquid laundry detergent directly onto the soiled area.
Let the detergent soak into the collar for at least 30 minutes.
Wash as normal.
Note: Do not put your shirt in the dryer unless the stain is completely removed. The dryer will cause the stain to set, making it  difficult to remove.

From Dark Clothing

For darker clothing you may not want to use hydrogen peroxide and risk lightening the fabric, try this solution instead.

Run the stain under warm water for a few minutes to wet the area.
In a small bowl, combine 4 tbsp of baking soda with 1/4 cup warm water into a paste.
Apply a generous amount of the paste to the stained area.
Gently rub your shirt together to help work the paste into the fabric.
Let the paste sit for 30 minutes and then rinse the area.
Wash as normal.