Is saliva or nasal mucus considered najis (impure) in Islam?

No — the overwhelming majority of scholars consider human saliva and nasal mucus to be tahir (ritually pure), unlike urine, feces, blood, or vomit. This is supported by numerous reports describing the Prophet ﷺ applying his own saliva to children for blessing, and by the absence of any instruction to wash items merely touched by saliva or mucus. Islamic law tends to treat bodily secretions not explicitly named as impure as pure by default, reflecting the broader principle that religious obligations aren't meant to create undue hardship — 'He has not placed upon you in the religion any difficulty' (Quran 22:78). Practically, this means a sleeve used to wipe a runny nose, a baby's drool on clothing, or spit on a surface does not require special najasah-removal before prayer. Ordinary hygiene — washing hands, using tissues, disposing of them properly — is still encouraged as good manners and sunnah practice, but it isn't a purification requirement in the way removing blood or urine is.

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