Every Muslim should be keen that all what he eats and consumes is free from impurities. This is the safe option that one should adopt. The Prophet (peace and blessings be upon him) is reported to have said, “Cleanliness is half of faith.”
Dr. Salah Sultan, President of the American Center for Islamic Research, Columbus, Ohio, and member of the European Council for Fatwa and Research, states the following: In principle, if the najasah or impurity penetrates through the whole meat, then the meat becomes haram (forbidden) to consume. For example, if a child pees on the meat, it cannot be used again.
However, if the najasah can be easily removed, then the meat can be used. For example, if pork touches the halal meat, then the part that was touched can be cut off and the najasah will be removed.
The basis of this ruling is based on the story of Maymounah (may Allah be pleased with her) when they got rid of the whole dead animal, and the Prophet (peace and blessings be upon him) commented, “Why did not you take the leather and tan it?” So, the point here is to try to save whatever is useful and use it.