Once the fiber has been carefully sorted and graded (by size of fiber, length of fiber as well as by color), it is off to the mill where it will be washed. Alpaca fiber is washed with hot water (160 oF-70 oC) and soap (regular dish soap will do the trick). So no harsh chemicals.
At home, for your alpaca garment, you will only need cold water and a small amount of mild liquid detergent. Eucalan soap products are great for delicate, no rinse washing.