Due to merino wools innate antibacterial and stain resistant properties you generally will not need to wash your pants after every use, but when its time, here is how to do it:
Turn your pant inside out and machine wash cold on gentle cycle with like colors.
DO NOT USE Bleach or fabric Softener
Line Dry or Tumble Dry Low
If needed iron or steam on low setting
Yes, you may dry clean if you desire.