Small pieces of food that stick to the non-stick waffle grid should be easy to remove by using a pastry brush to brush off the food bits. Try doing this when the grid is still a little warm and not completely cooled off. For washing off the excess oil, if the grids are removable hand wash in sink with soap and water. If the grids are not removable then hand wash with soap and water. Never soak or completely immerse appliances like waffle grills in water.