Fill the bucket with water. Let both pieces of sandpaper soak in the bucket for about 10 minutes.
Use the 220 grit sandpaper to sand down the chrome. This will cause the surface of the metal to become less smooth, which will cause the luster of the chrome to fade and gray out. Sand the chrome thoroughly until the polish is gone.
Use the 400-grit sandpaper to sand the chrome down one more time, but very lightly. The objective here is to smooth out the roughness created by removing the shine without causing further damage to the metal's surface.
Soak the cloth in the bucket of water and wring it out. Use the cloth to wipe away any debris that may have been left behind by the sanding process.