Step 1. Pour ice down the drain.
Step 2. Pour rock salt into the drain on top of ice.
Step 3. Run cold water and garbage disposal for 5 - 10 seconds.
Step 4. Add drain plug and fill the sink with 3 - 4 inches of cold water.
Step 5. Remove drain plug and run disposal to remove debris.
Step 6. Put lemon peels down disposal and run to give a fresh scent to the kitchen.