Have you tried the products from a company in todmorden lanc's that provide their products to some big name manu'fs and resellers. They are specific to home or car and guaranteed non staining. The smell lasts months whilst nourishing leather better than anything I've tried before. Good stuff . i think they also do an air fresh we in trad leather scent. It's isn't the cheapest but it last for a couple of years at least if you get one of their pack deals. Liquid leather ( gliptone ) todmorden. They have a website with everything on and delivery is next day.