Powder at the beach! As many times as I've been to the beach! I never knew this! Easily remove sand from your hands by "washing" them with baby powder! This works great for cleaning kids up after playing in the sand box as well!
"When ever we go to the pool or beach, I place my phone in a snack size ziplock baggie. I can still use my phone through the plastic with my wet sandy hands." (Not that I ever go to the pool or the beach. But it's a nice idea in theory.