ANSWER: If there are no haram ingredients in it such as saki, this is permissible.

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ANSWER: Why would you do something as weird as that? This is unhygienic and would lead to health issues and hence not permissible. 

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ANSWER: It’s mandatory before eating or drinking anything halal.

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ANSWER: Simply throw it away. Only the name of Allah when written in Arabic or ayahs of the Quran in Arabic must be treated with utmost respect, other papers that you mentioned can be thrown away.

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