re: I used one of those auto car washes for the first time and it scratched my car

Assuming the scratch was from the car wash and not there already but covered by dirt/grime, it'll likely buff out. If it was a truly touchless wash, it should not be able to scratch all the way through the topcoat. Try some Meguiar's scratch-x for starters, if that doesn't clear it a DA polisher with a cutting pad and mild abrasive polish may work.

ETA: For anyone who really cares about scratches/etching in their paint, avoid auto car washes like the plague. Scratch factories.