Cleaning and scaling as a process include removal of plaque, stains and calculus from teeth. And for whitening of teeth bleaching is done which is entirely a different process. Usually two to three sitting is required for the desired shade chosen by the dentist. It's very effective process as you yourself will find the difference after the first sitting itself. But lasting effects depends upon type of food intake and oral habits. Charges may vary from 8k to 15 k.