Blender Cycles Render - How to remove "grains" in your scene

Cycles Render is a great set of tools, shaders and other features which, lets the user create very realistic models. However, many people face the problem of "grains" appearing on the screen, which negatively affects the final outcome. The scene doesn't look very nice and out of focus without much details. (See image below):

Fortunatelly, you can solve this problem very easily. Just follow these steps:

1. In your properties box, click 'Render' (camera icon)
2. Look for 'Sampling' and open it.
3. On the right hand side, you will find a 'Previev' box. Set it with a larger value.

Remember that the bigger number you set, the longer it would take to load a scene. I set it to 1000, which is a lot, however enough to make the result look much better: