Quick Answer
Permethrin-treated clothing lasts for at least 70 washes and retains its insect-repellent properties for up to 6 washes after that. The treatment can withstand multiple years of wear, as long as the fabric remains intact. It is also heat-stable and retains its effectiveness even after repeated machine drying.
Treatment Duration and Washing
Permethrin treatment for clothing is known to last for several years, depending on factors such as fabric quality, washing frequency, and drying methods. A study conducted by the US military found that permethrin-treated clothing retained its effectiveness for up to 3 years in tropical environments. In cooler climates, the treatment can last for 5 to 7 years.
Storage and Reapplication
When storing permethrin-treated clothing, it’s essential to follow proper storage procedures to maintain its effectiveness. This includes folding or hanging the clothing, storing it in a dry and cool place, and avoiding exposure to direct sunlight. Reapplication of permethrin may be necessary after extensive wear or washing, but this can be done by applying a commercial permethrin spray or cream rinse to the treated clothing.
Fabric Types and Washing Techniques
Different fabric types have varying levels of permethrin retention after washing. Cotton and polyester blends tend to retain the treatment better than wool or silk. When washing permethrin-treated clothing, use a mild detergent and avoid using fabric softeners or bleach, as these can reduce the treatment’s effectiveness. Additionally, consider using a cold wash cycle and line drying to minimize wear on the fabric.
Find more answers
Browse the full Q&A library by topic, or jump back to the topic this question belongs to.