On average, rubbing your clothes on the Scrubba™ wash board for 20 - 40 seconds is sufficient to remove dirt, oils and odours from your clothing. For a machine quality wash, rub the clothes for 3 minutes. For stubborn stains, the clothing may either be rubbed longer or you may leave the clothing to soak in the Scrubba™ bag for 2 - 3 hours. When soaking be sure to keep the Scrubba™ bag in an upright position to avoid water leakage.