Your washing machine isn't a magic box. Throwing in clothes and pressing start is the fastest route to fabric fatigue. Chemical engineer Diego Fernández has outlined a laundry protocol that prioritizes both cleanliness and longevity. In an era where fast fashion and overconsumption generate millions of tons of textile waste annually, understanding the science of washing becomes an act of personal sustainability. Fernández, with years of experience in surface chemistry, argues that most people waste detergent, damage their garments, and paradoxically fail to achieve optimal cleanliness. His approach is data-driven: temperature, cycle time, drum load, and pretreatment are variables that, when properly adjusted, can double the lifespan of a cotton t-shirt.
The Science Behind Washing
Washing is part chemistry, part physics. Fernández explains that clothes clean each other through friction as the drum rotates. But that same friction wears down fibers. By controlling variables like temperature, load size, and pretreatment, you can minimize damage. In his experiments, he has measured fabric mass loss after repeated cycles: a 60-minute cycle at 60°C can remove up to 5% more fibers than a 30-minute cycle at 40°C. Fernández recommends 40°C (104°F) as the optimal temperature. At this level, detergent and sodium percarbonate work best. If you wash in cold water, extend the cycle to 60-90 minutes to compensate. He also warns against overusing detergent: half a cap is enough, except in hard water areas. Excess detergent not only leaves residues that attract dirt but can clog machine hoses and promote mold growth.
“"Baking soda and vinegar are useless for cleaning your washing machine" — Diego Fernández, chemical engineer.”
