I just finished the interior of my truck using black Ultraleather. I love the way it turned out but have noticed that the Ultraleather shows greasy spots (i.e. fingerprints and smears) easily. What product do you use to clean ultraleather. I love the way it looks now with the flat black finish and would like to keep it that way. I do not want to use a product like armorall that will make it shiny. What do you suggest??