There are several ways to remove black marks from your floor. The first is to use a mild detergent and warm water with a soft cloth or sponge. Gently scrub the area in circular motions until the mark has been removed. If this does not work, you can try using an all-purpose cleaner or white vinegar mixed with warm water. For tougher stains, you may need to use a commercial floor cleaner that is specifically designed for removing tough spots and stains. Test any cleaning product on an inconspicuous area of the floor before applying it directly onto the stain as some products may cause discoloration or damage to certain types of floors.