[BS_CS]

Yeah my CS is Black Sapphire so I know what you're going through. If you're under the shade but the car feels really hot when you're starting a wash, then what I'd recommend is rinsing the car with cold water as much as you can so that the paint feels cool. If it's hot to the touch then water will evaporate and cause water spots faster. I would give that a shot and see if it helps give you some extra time.