If you are one of the Apple Card users, pay close attention: Your card must be treated better than the rest - Which comes to almost no surprise since it's an Apple product.
According to Apple:
"If your titanium Apple Card comes into contact with contaminants that can cause stains, follow these steps to clean your card:
1. Gently wipe with a soft, slightly damp, lint-free microfiber cloth.
2. Moisten a soft, microfiber cloth with isopropyl alcohol and gently wipe the card.
Don't use window or household cleaners, compressed air, aerosol sprays, solvents, ammonia, or abrasives to clean your titanium Apple Card.
Some fabrics, like leather and denim, might cause permanent discoloration that will not wash off."
Like Leather and Denim? Excuse me? My cards either go in my wallet which is leather, or my pocket, WHICH IS JEANS 80% OF THE TIME!
Here are some helpful links to cleaning supplies for your card:
1. Microfiber Cloths ($8.99 USD)
2. Isopropyl Alcohol ($2.75 USD)