Unfortunately, no. Non-removable stains can, for example, be caused by superglue and polyurethane construction phone (stains are too intensely cured) (drawing)-indian ink (not on water-based) Edding permanent inks/felt-tip markers as well as permanent ballpoint pens. Most of these write in black. Stains which are pigment-based and have been washed before the stain removal and/or have been ironed in, also can't be removed anymore.