yeah, people are just not getting that there's no leather on the case, no leather is coming into contact with any wipes, UNTIL the coating rubs off. you're wasting your time using oil or leather polish on it because it's not leather. if you think your blue case is blue dyed leather you're just not grasping how the cases were made this year. it's a coating. the first time you get a deep enough scuff on the case, you'll see this pretty clearly.
i've had leather jackets, bags, shoes, you name it -- if it's genuine leather and not suede you can wipe them down with a little soap or damp wipes and it's fine. alcohol, again, should be relatively harmless with only minor color transfer. you might get some color transfer from your jeans or whatever, i had an orange leather fossil bag that would always happen to. and even that can be cleaned off if it's real leather. leather can take some wear and tear! that's the whole appeal of buying leather! that's what the scuffs and patina mean, that it's been well used. but it doesn't rub off or melt away lol.