A professional car detailer told me that people focus too much on cleaning leather and not enough on conditioning it, especially in convertibles, where the leather is often light-coloured and becomes dirty quickly with the roof down. (She told me to take the wind deflector out and wash it in the shower. The dirt that came off was surprising.)
She said that our natural inclination and the principle promoted by product makers is 'It must be clean before you condition it', with the result that the leather's often over-cleaned - stripped too much, 'un-dyed' just a bit too far, stiffer than it was ... et cetera.
She won't use 'magic' cleaners or worry too much about cleaning the leather and perhaps/probably damaging its surface. Rather, she cleans the muck off with wet wipes carefully & repeatedly and then conditions generously & repeatedly The conditioner dissolves a lot of any remaining dirt, which can then be dry-wiped off, be a barrier against some future dirt and, most of all, stop the original surface of the leather from failing.