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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.
Select from: [I] Straight acetone is best for the job since the acetone can dissolve some of the enamel. Acetone residue may still be effective even if the acetone doesn't come off. [II] Using acetone on your nails will also remove the polish, making your nails appear flawless and healthier. Acetone nail polish remover is an antimicrobial solution. [III] Since you'll be rubbing the paint off with your sandpaper, and you don't need acetone, you'll need a plastic bottle. Mix the acetone and nail polish remover. [IV] Any brand will work, and the higher the percentage of acetone, the better. Pour acetone or nail polish remover onto a cloth.
[IV]