I recently purchased a Samsung UN50EH5300 as a secondary TV. I noticed the clouding issue within the first couple of hours of use. This was completely unacceptable of course. I had never experienced this problem before in any of my TV's or monitors, but I remembered reading about the rubbing or tapping fix some time ago. I decided to give it a try.
It worked, and it worked wonderfully. Those shooting down this technique without ever trying it are doing themselves a disservice. The amount of pressure required to achieve the desired results is negligible. I sold Tv's for a major retailer, was a Sony technician, and run two "tech blogs" with a 3rd launching this year. I have also had countless conversations with reps and techs from all the major TV manufactures. This technique can be done safely, if you are careful.
I repeat, THE AMOUNT OF PRESSURE REQUIRED TO ACHIEVE THE DESIRED RESULT IS NEGLIGIBLE. When it coms to clouding, the issue does in (some cases, not all) fact seem to be a slight separation between some layers of the screen. When you rub or tap the affected area (which I would recommend doing on a completely black screen and off angle to make the clouding as visible as possible) you will see a slight pulse in light as the panel realigns itself. While LCD screens are fragile... they are not fragile to the point that they can not be touched. Could you damage your screen by doing this? Sure, anything is possible... but it's extremely unlikely given that the required pressure is so little