Well I thought this was interesting circa 1908-1918 How to take stains out of a hankie. I have never tried milk before, interesting indeed! Need pretty wedding hankies, special occasion handkerchiefs, monogrammed hankies, embroidered handkerchiefs, Find them at Nanalulus Linens and Handkerchiefs here: http://www.nanaluluslinensandhandkerchiefs.com/Ladies_New_and_Vintage_Handkerchiefs_Hankies_s/1921.htm
How to get those yellow stains out of clothes and linens that have been in storage. Put yellowed items in a large pot of water. Add 1/4 cup salt and 1/2 cup baking soda. (Alternatively you can do this same method using an oxygen bleach.) Hot hot hot water!