What kind of laundry powder or laundry detergent should be used in an underwear washing machine to wash more cleanly?

Whether an underwear washing machine washes cleanly depends mainly on using the right cleaning product. This is because stains on underwear are mainly protein-based stains such as blood stains and secretions, which are completely different from the dust and grease on ordinary outer clothing. Ordinary laundry powder or laundry detergent finds it difficult to thoroughly break these down in a targeted way.

🎯 Why are ordinary washing powder or laundry detergent not enough?

Ordinary laundry powder is relatively alkaline. Although it has strong stain-removal power, it easily irritates the hands and damages clothing fibers. It also does not dissolve easily at low temperatures and tends to remain on the machine and underwear, making it unfriendly to sensitive areas.

Although ordinary laundry detergent is mild, its formula mainly targets dust and sebum, and it lacks special ingredients for breaking down protein stains. It is often not strong enough against blood stains and secretions.

✅ For underwear to be washed by machines, check these core ingredients in the laundry poweder or detergent on the following list:

It must contain “enzymes”: especially protease. It is the key to breaking down protein stains such as blood stains, secretions, and sweat stains. Some products are labeled with “compound protease,” which has higher activity and can take effect even in cold water, making it very suitable for machine washing.

The formula should be mild: give priority to neutral or weakly acidic laundry detergent (with a pH close to human skin). Clothes washed this way are not stiff or irritating, and are easy to rinse clean, helping avoid residue.

Look for “sterilization,” not “bacteriostasis”: underwear has high hygiene requirements. “Bacteriostasis” only prevents bacteria from multiplying and has a relatively low threshold; “sterilization” (or a label stating “sterilization rate ≥99%”) truly kills bacteria and better meets the needs of close-fitting clothing. When purchasing, you can check whether there is a third-party test report.

🚫 Try to avoid
Ordinary laundry powder: too alkaline, difficult to dissolve, and easy to leave residue that irritates the skin, unless you are sure it can be thoroughly rinsed and the clothing is durable enough.

Chlorine-based bleach / 84 disinfectant: too corrosive, it will damage the elastic fibers and color of underwear, and must never be mixed with laundry detergent.

💡 Tips for machine washing

Even if you are using an underwear washing machine, it is recommended to apply the laundry detergent directly to the crotch area or the stained area, let it sit for a few minutes, or first run a short pre-wash so that the protease has time to break down the stains. The effect will be much better. If the blood stain has already dried, you can first rub it briefly by hand before putting it into the machine.