Many times, if we leave the white countertops untouched for many days, a layer of dust builds upon them. So, it appears a bit yellowish or blackish. To remove this yellowness, you can follow up on the above methods. But, sometimes, if the layer is too delayed, it becomes permanent on the surface. In that case, you can use spirit and wipe it hard with a microfiber towel. Spirit helps to remove even hard stains.
Now, let us see the specific methods of cleaning for few materials like granite, marble and quartz.