no problems at the moment with backlight bleeding and clouding on the w4500 great picture quality with both Sky plus and blu-ray very pleased with w4500 better quality than I expected.
Would recommend use of a damp microfibre cloth . Roll it into a sausage shape and rotate it constantly as you traverse the screen ; this way the (abrasive ) dust is removed and not presented again to the soft plastic surface . No static generated so long as cloth is damp.
I have one of those Pledge fluffy dusters, sucks up dust like a magnet. Excellent for the shiny tv surround and stand, also gets all the small dust particles from the microfibre cloth. I was using the cloth dry so it tended to move the dust around rather than remove it.
The cleaning fluid is alcohol free and leaves an anti-static, optically pure and water repellent film. Its also safe to use on screens with any special coatings.