Man, you guys are making me feel bad... I wash it when it needs it for the most part. In my opinion, MY hid a lot of dust not dirt per se. Truth of the matter, I try to wash it every two weeks or so and slap on another coat of Zaino. It's not a daily driver though.
My process is simple, hose, bucket, sponge, and Zaino wash. Hose down the car and get rid of any lose dirt or debris. Go at it with the sponge one section at time working top down and rinsing it along the way. Everything below the BSM's is washed with a different sponge. Wheels yet another sponge... I know anal- considering I don't wash it all that often. Dry with 3 of those super absorbant artificial chamois things. Same process with the chamois rotation as with the sponge- I know, ANAL... Finally, ZAINO!!!
What's the deal with pressure washers? I thought they were bad for the finish?