I use the Crayola washable markers all of the time. I love them. The fine tip fit right into my stencils for marking....I have bought like 10 packs of these

I have learned that all laundry soap doesn't wash them out the same. Dawn dish soap works like charm! I have a spray bottle that I fill half with water and half with Dawn.. then I can easily spray where its needed. I have ironed over the marker and it still washes out just fine