ANSWER: No.  You must clean the private part, change the underwear and renew your wudu.   

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ANSWER: The sunnah is not to leave it more than 40 days. However, shaving it every week is advisable. 

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ANSWER: After you have washed off, you should sprinkle some water on your underwear and should tell yourself whenever you get the feeling that you have leaked something, that this is the sprinkled water on your underwear. You must not check your private part as this would open the door for being OCD

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