Take the blade off of the clippers using a screwdriver. Clean off hair and dirt with a brush.
Spray a little water on the 4,000-grain side of the honing stone. With the blade on the magnet, and with the teeth facing up and out, run the stone over it to sharpen. Switch to the 8,000-grain side to add final touches.
Allow the blade to dry completely before screwing it back onto the clippers.