First of all, please note that you shouldn't wash your sweater too often as it naturally doesn't retain smells or bacterias.
Like all wools, Royal Alpaga should be washed cold. However, it's more resistant than any other wools and supports better machine-cleaning.
We still advise you to wash it very gently - either hand-washing or using only cold delicate washing cycle. You can place your sweater upside down in a protection net. We also recommend using soft shampoo or special wool products.
To dry your sweater, we advise placing it away from any source of heat or from the sun. You can dry it flat by putting it on a damp cloth.