ANSWER: No, one doesn’t have to do istinja when they break wind. They simply have to renew their wudu before praying.  Doing istinja after breaking wudu due to passing wind is an innovation. 

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ANSWER: No, this is not a must.  You can wash it once, twice or maximum 3 times.  https://www.assimalhakeem.net/how-to-do-wudu/

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