Traditional rubber bellows trap dirt and bacteria, but ASKO washing machines with Steel Seal™ eliminate this issue. Eliminating the rubber bellow ensures a hygienic wash cycle with 95% less bacterial growth, proven by a third-party institute*. The Steel Seal™ also increases durability and makes loading and unloading easier. *d to traditional washing machines with rubber bellow. Independant testing by Mikrobiologija Avbersek (Slovenia) ASKO washing machines use high-quality stainless steel for both the inner and outer drums, unlike er models that use plastic, which can harbor dirt, mold, and odors. This material allows higher spin speeds, withstands high temperatures, and helps disinfect the machine, ensuring superior performance, hygiene, and durability.