Wash, dry, wax.End of story.You have to dry car if you want no spots.To keep it looking good takes a lot of effort.
My wifes car was just detailed,by me, then it got rained on and she parked it in garage and let it dry and spots appeared.
I bought a stack of micro fibre towels at sams club and told her to use them.LOL
I am going to try Turtle wax Ice and see if it is any better.