WHITE COTTON SHIRTS GONE YELLOW
Have numerous high end white business shirts that are slowly turning a light yellow colour. They are all beautiful cotton and with a lot of life left, just noticing a very slight discolouration.
Any suggestions for returning them to white white.
From Wiki: Bluing, laundry blue, or washing blue is a household product used to improve the appearance of textiles, especially white fabrics. Used during laundering, it adds a trace of blue dye (often synthetic ultramarine, sometimes Prussian blue) to the fabric.
Also good for wasp stings.