What should one do about tahaarah (purification) if one can find neither water nor dust?

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Check below answers in case you are looking for other related questions:
The wudoo’ of one who has something impermeable on his hand etc.
There is some kind of crusty scab on his eye – what effect does that have on his wudoo’?

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The wudoo’ of one who has something impermeable on his hand etc.
There is some kind of crusty scab on his eye – what effect does that have on his wudoo’?

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