My car has this discoloration (like the rainbow you see in soap bubbles) on the back half of the car, and I don't know how it happened. There are even leaf "stains" on some parts where it discolored after leaves were left on too long. How do I fix this?

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The discoloration is like the rainbow you see in soap bubbles, and it's only on some of the car. In the fall when leaves weren't cleaned off and left on too long, there are impressions from the leaves with the same discoloration on some parts. Not sure how it happened, and a car wash doesn't clean it. What is this and what can I do?