Your washing machine can develop a serious case of mildew. And according to Better Homes and Gardens, the simplest way to prevent mildew buildup -- which can make your newly washed clothes smell musty -- is to do one thing: Leave the door open. Whether it's front-loading or a top-loader, leaving the door or lid open after use lets the machine dry out. And since most of us are using cold water to wash our clothes, it's even more important to do this, since only hot water can kill mildew.
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