If You Leave Wet Clothes in the Washing Machine
Most likely: Nothing will happen. "You won't get an odor within 8 to 12 hours," says Lucinda Ottusch, lead home economist at the Whirlpool Institute of Fabric Science.
Worst case: If it's very humid, mildew can develop and create an odor or, over a long period, tiny stains in the clothing. Mildew freckles, left untreated, can rot the fabric. To get rid of mildew, soak the clothes in warm or hot water (depending on the care instructions) with a cap-full of detergent.