I've tried the felt tip marker that needs to be immersed and it does wash out well but the marker stains the lighter quilting threads I sometimes use. I've never tried the marker that needs to be ironed out. If it's white, what do you use on white fabrics? I like the disappearing markers on darker fabrics with darker threads but the creams and whites just don't work well. I've even used monofilament thread but it still doesn't always wash out from beneath it. I do know that my Gram always swore by the tailor's chalk but that doesn't always work for me like it does for her. Next time I'm in Joann's I'll look for the marker that irons off, I know where it is so I'll give it a whirl but the others are just driving me nuts.