Check if the stain is from the inside or directly from the outside.
Ask what was the cause of the original stain.
Baby Wipe is alkaline, so may have compound the original browning.
Use a low pH cleaner system using a cotton swab to test with ProCleaner-1.5 > Acidifier-2.0 system, it should lighten the stain if it is pHn related.
Otherwise it could be any liquid from vegetables, fruits, plants, herbs, cola, etc.
It could be some sort of “tannin” derived stains. If so, use TanninCleaner-3.5 and follow with Acidifier-2.0 as rinse. Then saturate the stains and the entire bag with TanninCleaner-3.5. This is a redox (reduction-oxidation) treatment, so it will take an overnight chemical reaction when dry for an inspection.
See instruction if the stain is a tannin stain from this link:
http://www.leatherdoctor.com/leather-aniline-tannin-stain-remover-kit-a5-ns/
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Roger Koh
Leather, Skin, Hair, Eye & Acne Care System Formulator
Consultant / Practitioner / Instructor / Coach
web: www.leatherdoctor.com
forum: www.leathercleaningrestorationforum.com
email:
[email protected]