To avoid washing away the water repellency finish on technical shell garments you should pay attention what do you use for washing it. Same goes with woolen and synthetic first/mid-layers. Wrong washing chemicals gather into the fabric due time and for instance they wash away wools own wool fat. Also down gets weakened by wrong washing agents and looses it's insulating properties.
4.90 €/bottle Elokuu Gentle Laundry Liquid for Wool and Silk, Uncented Ecological liquid washing liquid for wool, silk and other delicate fabrics.
13.90 €/piece Nikwax Down Wash Direct 300ml The only technical cleaner which cleans effectively, while restoring water repellency and maintaining fill power and insulation.
4.90 €/piece Sonett Liquid Stain Removing Gall Soap, 120 ml, Bio-Degradable Liquid stain remover soap, highly effective against marks caused by ballpoint pens, ink, blood, fruit etc.