When you wash at temperatures below 60?C, bacteria can survive and can be transmitted between garments in the wash. Dettol antibacterial laundry sanitiser is an additive that kills 99.9% of bacteria, even below 30?C . You can be confident that your laundry is hygienically clean every time, whatever temperature you wash at (proven to work in rinse cycle temperatures as low as 15?C). Just add it to your normal washing routine after adding your detergent.