Japanese NORO Kureyon, brushed wool, numbers 88 and 138 (I think):View them here
Soak in cold water with Woolite or other fiber-friendly mild liquid soap. Nothing antibacterial or with anything that could be counted as bleach. Rinse in cold water; don't wring or twist. Roll into clean, dry terrycloth towel. Block out of direct sun and away from heat.Credo: Machine washing/drying handknitted socks is premeditated murder.