There is a recipe for this but its on my pc at home. I do know that when you use the blue marker it is suggested to soak it because the marks or remnants of it will show back up. So at least soak it in cold water, I do mine for at least 15 min. I have used it on starched fabric before without any problems; no heat or starch after the marker though. I'll try and remember to get the recipe. I think it had baking soda in it. Can't remember, it's been a few yrs