I had a client (90s) press her small quilt top with the Blue Be Gone still on. I tried soaking it overnight with a product called "Linen Wash" by LeBlanc (made in the USA) and the Blue Be gone was gone the next day. I have never tried these pens before but with using an iron for the marks to disappear, that just makes the hair on the back of my next stand up. Is there any type of applique that can hid the areas?? Hugs coming your way!