Washing with soap when doing Wudoo', and changing a baby's diaper

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Check below answers in case you are looking for other related questions:
Ruling on doing wudoo’ with hot water
There is some kind of crusty scab on his eye – what effect does that have on his wudoo’?

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Related Answers:
Ruling on doing wudoo’ with water that is contaminated but not naajis (ritually impure)
Someone told him that it was not obligatory to wash the arms in wudoo’; what is the ruling on the prayers he offered previously?
He is suffering from a skin disease – can he do tayammum?
Ruling on doing wudoo’ with hot water
There is some kind of crusty scab on his eye – what effect does that have on his wudoo’?

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