On more than a few occasions I've found myself shooting pictures at a wedding reception or other event and I have become separated from my lens cleaning supplies. I found a handy tip recently for emergency lens cleaning.

Find the nearest bar (should be easy if you are at a wedding reception!) and have the bartender moisten a soft, clean napkin with vodka. Then clean your lens with the napkin just as you would with a lens cleaning tissue and cleaning fluid.

(Just try not to drink too much vodka!)