Is there a cleanser that is delicate enough for soft leather shoes?

Just use Mothers Leather Cleaner. It’s made for all sorts of leather except suede. I use it on everything from shoes, jackets and even my car seats. Its great stuff just make sure that if you put too much on that you wipe off the access with a damn cloth or you’ll have a slight white residue which won’t hurt the leather but it will make it look not as nice.