i use lots of colors of chalk as needed- but i always test before using it- every project/fabric is different- sometimes it comes right out, sometimes it's more difficult- remember to not iron over the marks (set the color) i generally brush off as much as i can or use an art eraser which generally works really well- if it's a bit more (difficult) i use a wet washcloth- or i spray the areas with stain remover before the quilt goes into the wash. (i always launder every quilt i make as soon as the binding is done- so most often that is when my marks disappear)