i only used Zaino when i had my Z28 (i was anal) and now i just use whatever. i think i've only waxed the durango twice in the almost 3 years i've had it. it's weird. ever since i've decided that my durango is a DD and it's going to get messed up i'm not as worried about the paint. i'll wax/clay it occasionally and i'm happy. it still beads water but it's been probably 8 months since i've waxed it. i only get it washed once every 2 months or so. right now it's filthy and i can't justify getting it washed since i've got to do close to 350 miles of driving saturday so it'll get hammered (i've had weekends like this for the last 6 weeks).
it really needs to be clayed but i'm kinda lazy. last time i spent 3 hours claying and another 45 or so waxing and a month later you could see all the crap in the paint again. i'd almost rather have a dark car and deal with scratches than a white one and have to deal with seeing crap in the paint.
it's just hard for me to find time to dedicate a day to cleaning my car. it doesn't help that it's always sitting outside and i put a lot of miles on it.