I throw the tire-wet on mine a few times a year, but I'm going to need new tires soon, so I don't worry about it too much. Like the man says, a light coat is all it takes. Any more than that is useless, it gets so sticky that it grabs bugs and dust for days.
A big problem with me, working the night shift, is bug splatters. I found stuff that gets 'em off well, but it also contains a wax, which looks weird if you just use it to get a couple but splats off without washing and waxing the whole car.
But the stick-on tinting on the headlights makes it easy to keep them clean at least.
