Wow! I know what the classic Balenciaga bags look like but what is the leather itself? I avoided Apple Garde for as long as I’ve been buying bags, until last summer when I used the spray (ugh)on a smooth leather Ferragamo bag in almond which would certainly have stained. I don’t use that bag much so I don’t see any change.
But that’s an eye-opener! Perhaps it has to do with the kind of leather. So many baggers love it. Also the Meltonian, which I’ve used for I can’t tell you how many years, was only a slight cosmetic fix that wouldn’t even work again (and may have accelerated the deterioration too.)