Best way to preserve your paint and your dash, ect is to park your car out of the Sun. No wax beats that at all. Hell, too much sunlight isn't even good for your skin or your tires for that matter.
I'm into Chemical Guy's products. JetSeal sealant for paint and 5050 carnauba wax for the pop. I use a power washer foam cannon to wash it. Mothers on the bright exhaust tips, inside the pipe and outside. I treat the plastic. I treat the leather. I treat the door seals. I treat the tires. I seal and wax the wheels. I even wax the door jambs. I use a windshield reflector to keep the sun from frying the dash.
I want Svetlana to look good and last. Like my buddy tells me, even that rental car silver looks good...lol