Mold or mildew should produce a musty smell.
It can be contain or kill with a leather fungicide such as d’Mold-3.6 but, damages created remains; that will require color refinishing.
The color and the pattern does not suggest that they are caused by mold; could possibly be from some painting work that causes it.
If it is other than mold or mildew, then the stain is more likely to be removed with Prep-7.7 > Cleaner-3.8 > Rinse-3.0; however removing it may reveal the finish damages a well.
The third possibility would be using Bleach-9.9.
Cleaning it will all depend on the source of the stains as seen from this guide.
http://i300.photobucket.com/albums/nn4/Rogerkoh/SemiAniline-LPG.jpg
Semi-Aniline Leather Problem Solving Guide
Kits:
http://i300.photobucket.com/albums/nn4/Rogerkoh/Leather%20Doctor%20products/KitSA5d.jpg
Leather Doctor® Semi-Aniline Leather – Topcoat Refinisher - Dye and Ink Stain Remover - Kit Sa5.di
http://i300.photobucket.com/albums/nn4/Rogerkoh/Leather%20Doctor%20products/KitSA3mo.jpg
Leather Doctor® Semi-Aniline Leather - Fungicide - Odor Killer - Mold - Kit Sa3.mo
What do you think?
Roger Koh
[email protected]