To clean a kitchen after fumigation, focus on wiping down surfaces such as countertops, tables, and shelves with a damp cloth and mild detergent to remove any potential residue or odors. Wash any dishes, utensils, or cookware that may have been exposed during the process. If cabinets were left open, clean them thoroughly, and check for any remaining pests or signs of infestation. Ventilate the area well to ensure the air is fresh and odor-free.