Watering down your asphalt driveway is not required, but can be beneficial for your driveway. Asphalt driveways soften and harden as temperatures fluctuate. Watering down your asphalt driveway can help your driveway to adjust to those temperatures quicker and easier. If you see soapsuds, do not be alarmed. Soapsuds are a part of the process and are not damaging your driveway.