Girls question 18+ To prepare the cervix you need husband therapy, rig…

Girls question 18+ To prepare the cervix you need husband therapy, right? So, after intercourse I always wash my underarms... Question: To soften the cervix and get a good effect, DO I NEED to sleep without washing myself? Is it more effective or does it make no difference? (I know that it's disgusting and all that, but if the effect is good and on the next morning I will start contractions, then I am ready to do this?)