Why can't bleached down§₩∞ and waterproof down be used?‍←<

洗滌羽絨服有(yǒu)四忌：一(yī)忌堿性物(wù);二忌用(yòn↑₽Ωg)洗衣機(jī)攪動或用(yòng)手揉搓;三忌擰絞;四忌明(míng)✔>火(huǒ)烘烤。