1. Avoid heat
Wools react badly to heat. Remember this trick always and you will be assured that your trousers are in good shape. Think of delicate tricks such as cashmere, etc. need chemical cleaning ?! Think of it once again.
High temperatures and many chemicals used to clean these materials damage wool fibers. Wash in lukewarm water, preferably by hand washing and never use the drying machine. Some woolen materials such as Kashmir, may have on washing labels and washing machines. -In this case, always choose a short, low-temperature washing process with a delicate detergent such as Deka Color, Deka White or Deka Black.