I used to do that. I've done some leather-work over the years and have a few books on the subject. Belts mostly, just because its relatively cheap for some hides, rivets and buckles to make your friends single button belts in a solid 8-9 ounce leather, no cardboard. Once every 2-3 years, Brettuns Village even has real 8-ounce English Briddle leather. And, every book deals with shaping leather which must be done when the leather is damp for it to maintain shape.
Ergo, I've been following the as soon as its off straight to the trees.
But then those Church's I screwed up with oxygen bleach... thought alcohol would do it (even poured an 1/8 of a container in, swished it around and emptied just a dark drop) and when it didn't mixed a strong batch percarbonate. The rest is a 350$ mistake for the history books.
I'm pretty frustrated right now, to be honest. I really don't want to treat my shoes with something that has "odor compounds" added because of the nice ceder smell. Granted, Lysol should work if it doesn't stain the shoes, but even with repeat treatments I believe I should be stuck doing this for the life of the shoe which is extra effort I thought I was purchasing quality to AVOID. Call me vain, but I thought tanned leather was very resistant to mold.
The better clothing I buy (thrift) the higher the maintenance costs.
On that note, I found a library preservation pdf which recommended 2-Phenylphenol in aqueous solution to combat mold. Active ingredient in Lysol. I wonder if I got some in bulk (~100$/kg) dissolved a bit and soaked my shoes for 2-3 days in a tub if would I destroy them...
Down this path madness and science lies!