There are a few things you can do to clean a black toilet. The first is to use a plunger to suction onto the bowl and pull. This will help remove any dirt, debris, or other objects that may have built up on the toilet. Next, use a bucket or other large object to pour water onto the plunger and push and pull until all of the dirt, debris, and other objects have been removed. Finally, use a cloth or paper towel to dry everything off.