Laundry smells are almost always caused by bacteria surviving the wash cycle. Front-loaders trap moisture in the door gasket. Towels develop that musty "mildew" smell from biofilm buildup. Clothes that smell worse after washing usually have a detergent residue problem. Every fix here is practical, tested, and permanent.
Laundry smells are caused by bacteria surviving the wash cycle. This happens because of three common mistakes: not enough heat (cold water doesn't kill bacteria), too much detergent (residue traps moisture and feeds bacteria), and not enough drying time (damp fabric = bacterial paradise).
Front-loading washers are especially prone because the door gasket traps water and grows mold. Towels are the worst offenders because their dense terry cloth loops hold moisture and organic matter.
Every fix below is permanent — we don't just tell you how to mask the smell, we tell you how to eliminate the bacterial colony causing it.