Next time pour the urine on his own seat,make sure you pour it slow so it absorbs real good.After it seeps in all night ,the next day everytime the driver plops down on his seat he should get a good whiff of his own medicine.(He doesn't have to know you did it)Nobody should leave their garbage or the bodily fluids in their pkg cars.Pick up after yourselves!Your Mom dosen't work for UPS.
And what if somebody else has to drive that Package Car the next day? Why not just leave the bottle in the cup holder? Guys, just dump it out before you come back to the building if you have to use one. And no, there are no public restrooms on my area.