Not many people know that but Merino wool has antimicrobial properties, as the natural lanolin in the sheep’s wool repels odour-causing bacteria. Since merino wool manages moisture so well, there is no wet environment for bacteria to grow at all.
Since wool outperforms other fibres when it comes to odour resistance, they don't need to be washed as frequently as synthetics. Simply airing your wool trousers will help cleanse the fibre.
If you need to wash them anyway: machine wash with similar colors at max. 30 degrees, do not bleach or tumble dry. Please wash our garments on a low spin cycle.