In all honesty, I wouldn’t worry too much about sterility. He would get a full washout and a bevy of antibiotics at the hospital. Besides that, placing dry gauze on scrapes will end up embedding in the surface and will hurt like a hell and restart bleeding when it is peeled off at the hospital. Any wound not spouting, I’d just leave it alone. If you have a bleeder, hold pressure until it stops, then leave it alone. Good point about disposable gloves, though. I’ll throw a few pair in my kit.