Remember what a time you used to have when Mary had to use unwashable ink for penmanship at school? She always spilled a few drops on her new red skirt or her white blouse, and you, her mother, were expected to remove the stain. What a blessing is washable ink! Plenty of thick soapsuds removes most ink stains in a hurry, if you treat the stains when fresh. So don't give the ink time to "set" in the material, and you'll have no trouble with it.