Opening bags

Is there a secret to opening all the bags (meat, produce, and actual shopping bags) quickly? I've noticed that if my hands are dirty (which... ew.), they open a lot easier. But for sensory and obviously sanitary reasons, I cannot stand for my hands to be dirty. Will that finger moistener stuff some cashiers use for handling cash help? This feels like a really trivial post but it is very frustrating for me and really the main thing slowing me down.