He's probably right, though. The only way I can think of for hand sanitizer to expire is for the alcohol to evaporate, and the alcohol is responsible for both germ-killing and peehole-burning.
I think probably isn't a good enough answer. I think you should try this and report back. Its for science you know. And in the pursuit of science sometimes these things happen. Thing of yourself as Marie Curie experimenting on your own for the advancement of science and mankind.
That isn't that bad. Basically only way I can drive is east for 7.5 hours before I get to anything resembling a city and have a choice of direction, without going further into nothingness.
Everyone tried masturbating with things they thought would feel good on their dick when they were younger. You quickly learn shampoo burns. But conditioner is ok. Dish soap is a no go, etc. I'm sure lots of people learned about the burn of hand sanitizer this way.