It was narrated from Ibn 'Abbas that one of the wives of the Prophet ﷺ performed Ghusl from Janabah, and the Prophet ﷺ performed Wudu' with her leftover water. She mentioned that to him and he said:

"Water is not made impure by anything." [1]

[1] See the following versions.

أَخْبَرَنَا سُوَيْدُ بْنُ نَصْرٍ، قَالَ حَدَّثَنَا عَبْدُ اللَّهِ بْنُ الْمُبَارَكِ، عَنْ سُفْيَانَ، عَنْ سِمَاكٍ، عَنْ عِكْرِمَةَ، عَنِ ابْنِ عَبَّاسٍ، أَنَّ بَعْضَ، أَزْوَاجِ النَّبِيِّ ﷺ اغْتَسَلَتْ مِنَ الْجَنَابَةِ فَتَوَضَّأَ النَّبِيُّ ﷺ بِفَضْلِهَا فَذَكَرَتْ ذَلِكَ لَهُ فَقَالَ " إِنَّ الْمَاءَ لاَ يُنَجِّسُهُ شَىْءٌ " .