Most dirt can be easily removed using a damp washcloth. The Peak Design Travel Backpack is treated with anti-absorbtion agents, meaning that most stains don’t penetrate very deep. If the stain/order is still present after the first rinse, repeat the hand wash, and gently scrub it with a soft-bristled brush. Rinse and repeat as necessary. Then let the bag fully dry in a well-ventilated area.