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Create a 50-50 distilled water and white vinegar mixture in a bowl. If you are just doing a light clean, lower the amount of vinegar. Apple cider vinegar can be a substitute as well, just as long as you aren't interested in sanitizing the leather. Wipe the solution over your leather until it is damp. Make sure to mix the vinegar with water, as straight vinegar can be too acidic for leather. Get a bowl and mix together two parts oil with one part water or lemon juice. Any natural oil will work fine and many people like the smell of coconut, olive, or even walnut. The oil will help to hydrate your leather, while the lemon will remove any dirt or grime. Apply the mixture to your leather until it is damp and then buff it with a microfiber cloth. If you are just interested in polishing your leather, then you can apply the oil directly to the leather. Make sure to keep the coating light or you could stain it. Place 10-15 drops of essential oil onto a microfiber cloth or sponge. Moving in small circles, gently work the oil into your leather. Leave no excess on the surface and continue until you cover all visible areas. Make sure to select an oil scent that you enjoy, such as lemon or lavender. Get one quart of warm water and add in a few drops of baby soap or natural detergent. Add a few drops of vinegar as well, if the leather is particularly dirty. Use this as a leather conditioner, as it will both clean leather products and help to prevent new stains. After applying this over the leather's surface, feel free to let it air dry. With all of these applications, it is best to use distilled water, as this will prevent you from adding particle residue to the leather's surface.

Summary:
Use a vinegar rinse. Wipe down with a natural oil. Massage with essential oils. Apply mild baby soap or detergent.