Non removable lining can be cleaned using a soft cloth with neutral soap and warm water. Rinse by wiping with a soft wet cloth. Removable lining can be washed by hand or in the washing machine using warm water (max 35 degrees) and neutral soap. We also recommend Motul M2 helmet interior clean - http://motul.co.uk/product/m2-helmet-interior-clean/
Always air dry the liner without exposing to sources of heat. Ensure the liner is completely dry before using the helmet again to prevent mould and unpleasant odours