Hanafi
The sources give no view for it here.
الاستنجاء بالريش
هل يجوز الاستنجاء بالريش إذا كان طاهرًا قالعًا؟
Each school’s answer
In our wordsHanafi
Not stated in the sources
Maliki
Not stated in the sources
Shafi'i
Not stated in the sources
Hanbali
Not stated in the sources
The texts
الاِسْتِنْجَاءُ بِالرِّيشِ: ٧ - لاَ يَحْرُمُ الاِسْتِنْجَاءُ بِالرِّيشِ إِذَا كَانَ طَاهِرًا قَالِعًا، وَلَوِ اسْتَنْجَى بِشَيْءٍ مِنْهُ وَشَكَّ هَل وُجِدَتْ فِيهِ تِلْكَ الشُّرُوطُ أَوْ لاَ؟ فَالْمُعْتَمَدُ عِنْدَ الشَّافِعِيَّةِ الإِْجْزَاءُ (٣) . وَيُنْظَرُ (اسْتِنْجَاء) ، (شَعْر) .
«الموسوعة الفقهية الكويتية» (Kuwait) entry «ريش» vol. 23 p. 205
From the schools’ own books
Maliki
The sources give no view for it here.
Shafi'i
The sources give no view for it here.
Hanbali
The sources give no view for it here.
What is «in our words» is our standard wording; the books’ texts stay as they are.