Malaria is a contagious disease that remains a public health problem in the world, including Indonesia. The use of mosquito nets is one form of community participation as personal protection equipment for preventing malaria transmission. This paper describes behavioral aspects of society in using mosquito nets. This aspect is part of the research on the effectiveness of malaria control conducted in Sorong and West Seram in Indonesia in 2015. However, we focused on the use of LLINs in Sorong with the sample size of 72 LLINs. The study revealed that leaching of the nets occurred as reported by 98.6% of respondents and they stated that the nets were washed when they were dirty. Out of 63.0% respondents in Sorong said that they washed the nets by soaking them with some amount of detergent. About 58.7% respondents dried out the nets by hanging them in the direct sunlight. The study concluded that people's knowledge about behavioral washing and drying the LLINs was not suitable for maintaining the residue of insecticides for killing the targeted mosquitoes. Suggestions were given to educate targeted people involving cadres and health workers on how to wash and dry out the nets to keep the content of the insecticides.