Cleaning the condenser coils is a crucial maintenance task to ensure optimal airflow and system performance. Use a garden hose to gently spray the coils, working from the top down. Avoid using high-pressure washes, which can damage the coils. For more stubborn debris, use a soft-bristled brush or a specialized coil cleaning brush. Finally, use a mild detergent and water to clean the coils, and rinse thoroughly to prevent any residue buildup.