There are several different types of leather conditioners available, including mink oil, leather honey, and neatsfoot oil. Even if you aren’t removing dye from leather, it’s a good idea to apply conditioner to your leather once a month in order to keep it looking shiny and new.
Dye removal products are designed to remove dye and ink stains from leather. They might be able to clean dye stains caused by blue jeans dye, newspaper print, fresh ballpoint ink, paint, shoe polish, and permanent marker from leather.
All products intended to remove dye from leather are a bit different. It is therefore impossible to give specific directions regarding use. Generally, though, you’ll need to apply a bit of the cleaning product to a rag, then wipe the dye away using the rag. Some products might direct you to scrub the leather with steel wool, a horsehair brush, or sandpaper after applying the dye-removal product.
Instead, test the cleaning product on a small portion of the jacket that will not be regularly seen. For example, you might wipe the product on a small area on the inside of the jacket and observe its effect.
Instead of lacquer thinner, isopropyl alcohol, acetone, peroxide, or ethanol might work, too.