Moving on from a kebab (or a nice chicken madras ?), I use decent quality wet wipes first, not just on the face but also downstairs. After a vigorous lunchtime session with a gf once I was emitting the unmistakable smell of sex each time I sat down for a couple of hours, a few knowing looks and grins in the afternoon but not much harm done - has made me very wary ever since though.
The beauty of wet wipes is that they are great at cleaning all sorts of things and can be stored in the car without raising suspicion. People think I'm a fucking genius for keeping a pack in the glove box
. Alcohol had gel works a treat too, just watch out for sensitive skin, it can end up looking raw for a bit.