Great question — answering as the UphillTech team:
It appears as if the leather has not been cured or sealed properly. Here are some methods you could use: Vinegar to clean the stains off the clothing. This should disable the stains, but may need a vinegar soak for a while. Using vinegar should not ruin regular fabrics. Using other acids like lemon juice, etc I do not know if work, but they should. Mixing the acid with baking soda should make a sort of scouring powder if you are trouble removing the stain with just the acid. Other methods are: Sealing the Leather again. I was under the influence that leather was suppose to be sealed. By sealing it again you could try to avoid this problem. Also washing the leather before using it. Cleaning...
Full answer by Pobrecita: https://lifehacks.stackexchange.com/a/3678 (CC BY-SA 3.0).
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