Do as I say, not as I do! Seriously though, if you can't remember the last time you washed your truck, go outside right now (it IS Saturday afterall) and give your ride some TLC. It's good for you and it'll make you feel better about life. You may even get a headstart on that summer tan. Maybe.
If that's just too much work, then do the next best thing and make "the kids" wash it. Yeah, they'll love it, plus they'll earn some cash. (Or, perhaps in many cases, make your high school classmates wash it.) Hey, sometimes it's advantageous to have a fun, real-life truck that doesn't live its life protected in a garage! (Wait, it does...but you know what I mean!)