Actually haven't polished it in about a week...it's actually quite filthy, it's just that i've polished it so many times since i bought it, even when it's dirty it looks clean
Y'know, people told me that when I bought the car 5 or more years ago...and I've made it a habit to try and wash the car EVERY day since that point, and polish it up about once a week, with obvious exceptions (going on tours to the middle east and such). Paint stuck pretty well...and it's great when people walk up and tell me they love my new paintjob