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Using a hairdryer can effectively clean radiators, improving their heating efficiency by removing dust and debris. Dust accumulation can hinder airflow, especially in radiators with fins. To clean, turn off the radiator and set the hairdryer to cool air. Direct the airflow between the radiator elements and behind it, while collecting dust with a cloth underneath. For stubborn dirt, a soft brush may be more effective. Regular cleaning helps maintain proper heating performance, although it may not directly reduce heating bills.