My Minus 30 merino wool base layer got fouled with elk blood this year (as well as my medium weight M-51 Army Surplus wool pants). I ran water over these clothes, rubbed the blood stained areas of the fabric over itself to loosen the crusty blood stains, and squeezed the water out of the fabric. Initially this water ran rusty red-brown. I repeated several times until the water ran clear. Then I put these woolens in the washing machine on a COLD water cycle and a DELICATE process cycle and used Woolite to wash. When the clothes had completed spin drying, I hung them up on clothes hangers outside to dry. I did NOT hang them in the sun. Also, I hung them over the cardboard tube type of hanger, letting the cardboard tube support the weight of the clothing. The Minus 30 base layer articles as well as the M-51 wool pants seemed to come out very well.