Spray a dry-erase surface with this specially formulated dry-erase cleaner to get rid of marks. This cleaner is non-toxic and safe for use in classrooms, homes or offices. This liquid Expo dry-erase cleaner has a 22-ounce capacity for erasing shadow marks, grease and dirt from whiteboards to keep notes legible. Comes in a blue bottle. 22 oz. cleaning spray bottle. Safety Data Sheet . Whiteboard cleaner removes ghosting, stubborn marks, shadowing, grease, and dirt from whiteboards. Features nontoxic cleaning solution. Remove marks from a dry-erase whiteboard with this 22-ounce spray bottle of Expo dry-erase cleaner.