Vegetable tanned leather gets dirty easily. Don't try to wipe with water, it will enlarge the area of the stain.
Saddle soap-assisted overall cleaning will take away moisture and grease from leather, and its residue is not easy to be completely removed from leather, so it is not recommended to use it when encountering small areas of stains.
Avoid using shoe polish during curing, because a large amount of wax in shoe polish will block the pores of vegetable tanned leather, change the properties of leather and make it hard.
Vegetable tanned skin will naturally change color after sun exposure and use, because vegetable tanned skin is tanned with vegetable tannin and will turn reddish brown or brown after oxidation.