Persil Non Bio Liquid Detergent 38 Wash is tough on stains while being gentle next to sensitive skin. Persil Non Bio is effective even in a quick or cold wash. Not only is our non bio laundry detergent tough on stains but it is gentle next to sensitive skin too; Persil Non Bio is dermatologically tested and Persil's skincare research is recognised by the British Skin Foundation, so you can be reassured it is gentle next to sensitive skin and suitable for the whole family.