This soap is without a doubt the best chalk-removing soap available. Eternity Arts has been using this soap in classes and in production of chalk for several years. Since our chalk is highly pigmented, it demands a better soap than what you can get off the shelf. While this product is more expensive that go-jo®, it is much more concentrated and does not have the sand type pumice that damages your hands and plugs drains. Kresto® contains ASTOPON®, all natural, biodegradable walnut shell scrubbers. It will not leave your hands raw or chapped. Kresto® is a water-soluble cleaner that is the ideal replacement for thinners and other technical solvents. The product actually works best when mixed with a little water as you scrub your hands. Try using Kresto and see the difference!