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How to get spray paint off a car
Get a bottle of acetone, or nail polish remover containing acetone.
You may not have acetone on hand, but you may have a bottle of nail polish remover. Nail polish remover is formulated to take the enamel layer off fingernails, which is essentially what you're attempting to do with your car's finish.
Any brand will work, and the higher the percentage of acetone, the better. Pour acetone or nail polish remover onto a cloth.