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🧺 Why Do Laundromats Advise Against Washing Clothes at 40 Degrees? Here’s What You Should Know

At first glance, 40°C (104°F) might seem like the perfect middle ground for laundry—not too hot, not too cold. So why do many laundromats and laundry experts advise against it? Surprisingly, there’s a science (and a strategy) behind those temperature settings, and choosing the right one could make a big difference to your clothes, wallet, and even your health.

Let’s break it down and see why 40 degrees isn’t always the ideal temperature.

🧼 1. It’s Not Hot Enough to Kill Bacteria or Germs

Many people assume that 40°C is “warm” enough to kill bacteria, but the truth is—it’s not. If you’re washing items like:

• Underwear
• Towels
• Bedding
• Gym clothes
• Baby clothes or cloth diapers

…then 40°C often doesn’t cut it. Bacteria, dust mites, and viruses can survive at this temperature. Laundromats often recommend 60°C or higher for hygienic washes, especially for shared or public-use items.

✅ Pro Tip: For sensitive items, using a laundry disinfectant or adding white vinegar to the rinse cycle can help kill germs without increasing the temperature.

👚 2. It’s Too Warm for Delicates and Certain Fabrics

On the flip side, 40°C can actually be too harsh for some materials like:

• Wool
• Silk
• Lace
• Certain synthetics (e.g. spandex or lycra)

These fabrics can shrink, fade, or degrade faster at higher temps. Most delicates are better off washed at 30°C or cold water with a gentle cycle.

🔖 Always check your clothing labels—your wardrobe will thank you.

💸 3. 40 Degrees Uses More Energy Than You Think

One of the key reasons laundromats discourage regular 40°C washes is energy efficiency. Heating water accounts for a significant chunk of t