After seeing the inside of the components of our swamp cooler and air vents here in Albuquerque, I'd second Hamburger's advice about the vinegar for the dishwasher and regular cleanings for other systems in the house.
About two months ago we had to have just about all the mechanical components cleaned or replaced because they were so badly coated with minerals. Big chunks of mineral deposits would break off in my hands and then crumble to pieces. This all happened in the last year since the a/c was serviced the previous season. I guess I had some early warnings last year that something was going on with the quality of the water here. After BBB had her blood clot episode and was put on blood thinners, I bought and installed humidifiers for the rooms she uses most to prevent nose bleeds from the dry winter air. A fine white powdery film started coating the furniture and television screens, so thick it looked like talcum powder when you ran your hand across them.
Something similar happened with the air vents in the house last winter. We were seeing (and breathing) these small white flakey things fall from the vents when the heat was on. Michael, our neighbor and handy person, opened up each vent in the house and vacuumed out layers of what looked like sand and mineral deposits from each of them. So, I'd also advise having your air vents cleaned out every few years as well.