Baby wipes they work great for all your cleaning needs
Camera
A First Aid Kit. It's nice to have something to plug holes when the "STUPID" side of the brain makes a charge to the front of the line so to speak.
I'll second (or third) the cell phone. Not that I want to call someone, but it's my spare light, camera, clock, weathermap, etc.
Went to the rifle range once, years ago, with no ammo.
Short trip.