What is the most effective way to get the yellow stains out of the armpits of shirts?

Use baking soda and vinegar as a stain remover. Rub it into the shirt, let it soak in soapy water for 10-30 minutes. Then scurb the stain out.

:).

Avoid hot water. It depends on how long they have been there. Soaking in baking soda may work.

Vinegar and water may work. Hydrogen peroxide and water may work. Wash in cool water afterwards with regular soap and rinse.

For colours and delicate materials you may want to do a test of a small safe area of the material.

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