I use a slice of potato to buff out the scratches and to clean away the built up dirt. And the edge of a potato slice is the perfect soft implement to dig the dirt out of the seams and the sole edge where dirt collects. Potatoes are mildly moist and minimally abrasive, perfect for finished leather.
You will be amazed at how well this method works to remove small scuffs. And it it leaves soft supple leather with no smell.
To clean up just throw out the tater and you're done. It works especially well with brown shoes that have been polished before and have more than the factory stain on them.