Backpacks should be cared for in much the same manner as tents. The biggest difference is the amount of cleaning that packs require. Heavy sweat from hiking and food smeared on the pack fabric (directly or from greasy fingers) requires much more thorough cleaning. A mild antibacterial soap, thoroughly rinsed after cleaning, should do the job. We use Dow “scrubbing bubbles” on the straps, back pad and hip belt, let sit ten minutes and hose off until the water runs clear. Then dry. Keep zippers clean and periodically lubricate with silicone.