Can washing the vagina after sex help prevent pregnancy?

　　Can washing the vagina after sex prevent pregnancy? Cleaning the vagina, i.e. after sex, female Immediately wash the vagina with water or other liquids to flush away the semen in the body to avoid pregnancy. Is this method reliable?

　　This method is not reliable because the scope of washing is only for the vagina, but before flushing, a lot of sperm may have arrived Uterus Cervix and uterus.

　　In addition, it is very dangerous to use disinfectants, such as Dettol, etc. to wash the vagina, because if the concentration is not properly formulated, it may cause burns or inflammation.