denim transfer is the worst, it's a dye and it penetrates deeply into the leather.There’s still some blue in the area I tried to wipe down ☹️ although I didn’t apply a lot of pressure... I’ll just have to try again, but maybe a bit more aggressively. At least it’s in the back of the bag if it doesn’t work. ☹️
do you have any trusty bag spa around?
i am a dare-devil, i would try myself to apply foam of the mild soap and then wipe it off by a clean wet cloth