Remember to use purified water in the steam iron, not tap water.
Tips
usage
熨 here is yùn (4th tone, 'to iron'), NOT yù. Compare 挂烫机 (guàtàngjī, garment steamer that hangs clothes) — a 蒸汽熨斗 is the traditional flat-soleplate iron, while a 挂烫机 is the upright steamer popular for delicate fabrics.