Place all the apple slices and the apple cider vinegar in a slow cooker set on high and cook for 4 hours.
Stir several times during the cooking, to make sure the apples don't stick to the bottom.
Once the apples are cooked, they should be soft enough to break easily with a spoon. Mash them with a potato masher or a wooden spoon until you get a sort of applesauce with skin.
Place the applesauce in a blender and pulse until you get a really fine puree with an almost buttery texture. You might need to work in batches for this.
Pour the apple butter back to the slow cooker. Mix in the cinnamon and cloves. Cook on high, uncovered, for another 45 to 60 minutes or until you get the desired texture.