The worst thing you can possibly do is wash a car in direct sunlight. I guess you learned that lesson the hard way... Wash your car on either a cloudy day or in the evening as you described in your 3rd try. You seem to have it down on the washing part - just keep the car constantly wet. When it's time to rinse/dry there is a trick to get most of the water off quickly. If you are using a nozzle on your hose, take it off and gently let the water flow over the car from the end of the hose. The water will sheet off and make it easier to dry. When drying, I use a leaf blower to get most of the left over water off. Start on the roof and work your way down. After this, use a microfiber drying towel and/or terry cloth to dry off any excess water. Hope this helps! It works great for me!