Auger blades quickly become dull when used to cut through ice. The edges need to be sharpened with a whetstone in order to make them smooth and effective again. There are two ways to sharpen an auger blade with a whetstone. The first way is to place the blade flat on the whetstone and move it back and forth while applying pressure. The second way is to hold the blade at an angle and move it up and down while applying pressure. No matter which way you choose to sharpen the blade, make sure to keep the angle consistent. Also, be careful not to press too hard on the whetstone or you could damage the blade.