Light salt water can clean the vulva, but it is best not to use it normally. It is not necessary to use light salt water to clean the vulva, but just use lukewarm water to clean the vulva. When you have vaginitis, washing the vulva with light salt water may reduce the itching symptoms of vaginitis. If you wash your vulva with light salt water for a long time, it may cause painful sensations in the vulva, so it is best not to use light salt water for washing in general. You can use warm water to wash your vulva every day. The vaginal opening, urethra and anus are close to each other and are easily infected by bacteria.