The spermatozoids have to enter the vagina, and then reach the uterus and the fallopian tubes where the actual conception occurs. If they have not entered in the vagina, conception is impossible. Furthermore, the spermatozoids need a specific environment to survive. The liquids produced from the vaginal mucosa are not quite good enogh for the spermatozoids.
In a particular part of the female menstrual cycle (when ovulating), the acidity of the vagina is changed so the spermatozoids can survive longer. They also need a certain degree of humidity, so when the sperm is dried it can no longer fertilize.
According to the information you provided, spermatozoids cannot fertilize if you washed with soap and water after fourteen hours. You might want to visit your family doctor to get more information about this issue.
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