Use of the right hand for istinja is prohibited. The relevant hadith wording is:
وَلَا يَسْتَنْجِي بِيَمِينِهِ
Translation: He should not cleanse with his right hand.
The left hand is used for cleaning the soiled area. This concerns the specific cleansing act, not a general prohibition on handling a water vessel with the right hand.
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Istinja: Methods, Preference and Juristic Differences
Use of the right hand for istinja is prohibited. The relevant hadith wording is:
وَلَا يَسْتَنْجِي بِيَمِينِهِ
Translation: He should not cleanse with his right hand.
The left hand is used for cleaning the soiled area. This concerns the specific cleansing act, not a general prohibition on handling a water vessel with the right hand.