Wash the garment regularly. The best results are achieved by a combined washing and impregnation. We recommend a Tokos detergent and impregnation:
Toko Eco Textile Wash and
Toko Eco Wash in Proof
Do not forget that it is important to wash and impregnate often! It is also good for reactivation of the membrane that it can be heated on LOW HEAT in a drying cabinet or dryer.
You can read more about it here.