As a regular user of Apple's leather cases, I wouldn't even care or clean them with any spray, liquid or water. Just use it as it gets dirty and grimy (it gets better, smoother, more supple this way)
Once you spray it and clean it with something, it'll never look, feel and smell the same. Essentially ruining the point of the case lol. Trust me, ask me how I know lol. It's super tempting to do it but it's not worth it.
The least I would do it wipe it down with a dry microfiber cloth to get rid of anything on the outer layer of the leather. But liquids, conditioners, etc? Pass!