Not sure what you mean by a blue jean stain. Assume you tried a quality leather cleaner first..I have two suggestions: 1. Use a little GOJO gel hand cleaner and a tootbrush. I use it to remove very tough stains from clothes before washing. GOJO is solvent based (waterless) and easily gets out grease, ink, wine stains, etc. 2. There is a carpet cleaning product made by Folex - you can get it at Lowes or Home Depot in cleaning aisle. I use it to clean just about any kind of stain from carpets, fabric - it really is pretty stupendous stuff IMO and costs about 6.00 for a 32 oz. spray bottle that lasts a long time. Might want to try either first on a hidden spot to be sure no discoloration. I think the GOJO might be a little easier on the leather.