Does anyone know how to clean all the picture of one person from my iphone?
I heard that this is possible but honestly have no idea how to do it.

 

When you open the "People album" for that photo you can select all photos, then use the "Trash bin" icon to delete them.
I usually do this way.
Hope it helps!

 

Thanks a lot for the hint! Started to google people album and found a great technical blog with the detailed instruction on how to do it.
https://applenapps.com/delete-all-ph...son-on-iphone/ here it is. It turned out to be simpler than i expected and the whole process took couple of minutes only.
It is crazy how many cool features all the new devices can offer to their customers.