Apply on dry-erase surfaces such as whiteboard, glass, porcelain, melamine, and most non-porous surfaces. Removes ghosting, stubborn marks, and shadowing from whiteboards effortlessly. Spray bottle for maximum board coverage. Let sit for 2-3 minutes. Use a soft cloth or board eraser to wipe the surface of the boards. Repeat if necessary. Tough on stains but gentle formula that will not harm the whiteboard.