Then what are you doing wrong, it's because people tend to believe in easy and fast process of doing things. Like whitening products that are used externally, this products promote that using them will whiten skin quickly and effectively, believe me they do their purpose but for short term only.
An advance way of skin whitening is not starting from the outer skin, like most beauty whitening products are used, but the opposite way around starting from the inside. There are product from Glutathione a sulfur-containing acid that give the body an antioxidant defense system, that's good for treating blood disorder, detoxify liver from toxins and alcohol. The only side effect is to whiten dark skin.
So saan ka pa!