Spritz the scratched area with a water bottle full of clean water. Attach the wet/dry sandpaper to the sponge pad and spray it with water, too.
Sand the scratched area. Spray the area and the sandpaper with water frequently to keep both surfaces wet. Continue sanding until the scratches are gone.
Rinse the area thoroughly to get rid of any grit. Apply a coat of rubbing compound directly onto the surface of the clear coat.
Attach the compounding pad to the buffer, then dab the compound over the affected area with the compounding pad. Turn the buffer on very slowly and move it back and forth over the affected area -- do not stop moving the buffer while it is in contact with the car. Continue buffing until the rubbing compound is no longer visible.
Remove the compounding pad and attach the polishing pad to your buffer. Apply a small amount of polishing compound or wax to the affected area and buff it into the clear coat with the buffer.