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Recently my LCD had some dog drool on the screen from one of my dogs shaking off. I didn't really know the method for cleaning the LCD because so many people say don't use chemicals as it will harm the screen color and make it look cloudy or hazy. Well, I just used warm water and a soft terry cloth towel and sure enough now where I cleaned looks cloudy and hazy where the rest of the TV has that clean glossy shine look from when it was new. My question is how do I clean the screen so that it looks like it did when I bought it? Is there a special towel / cleaning rag I can buy as well as specific cleaner? I don't want to go to a local sales guy because I never trust anything they recommend. Their job is to sell $50 HDMI cables to soccer moms.
I have never tried this on a HDTV screen so, this advice is without warranty of any kind, Your Mileage May Vary...
For my LCD monitors I use, and I have read elsewhere this works for HD screens as well.
Mix 70% Isopropyl Alcohol with distilled water no more than a 1:1 ratio (more than 50% Alcohol may be bad for the screen), mix well. Apply a light layer with a spray bottle, and wipe off with a clean lint free very soft cloth (I use the microfiber cloth that you clean your glasses with).
Always make sure to get all the dust and other abrasives off the screen first.
There do exist special LCD wipes at computer and electronics stores, and I would use those if you have expensive equipment. Personally, I use a damp cloth with isopropanol or clear Windex (harder to find than the blue version, but there is also no chance of staining anything blue, which did happen to one keyboard).
In my experience, sometimes a damp cloth will not remove material such as Dog Slobber, milk from the kids sippy, or a slimmy streak from a Ketchup laden finger. The only way to remove these more stubborn items was to allow them to dissolve By actually spraying them. I have tried several of the wipes on the market, but I found they all left streaks and didn't clean some of the more intense items such as listed above well. I can't stand streaks, marks, or finger prints on monitors but maybe I am just overly picky.
In any case, definitely need to use care if you are applying a liquid directly to the screen. I use a mister and get it just wet enough to dissolve the milk or slobber then wipe using a microfiber cloth.
Don't use any product that contains Ammonia (such as Windex) it will surely do more damage than good. Most of the wipes I have seen use Isopropyl Alcohol which is what I use diluted with distilled water of course.
I've been using Windex / Ammonia for a long time for cleaning many many things. It is actually a weaker solvent than isopropanol and so will not dissolve any plastic or do any damage. The only damage would come about from the water content, I would think. However, for expensive equipment, try the specific wipes made for LCD screens.
I use microfiber clothe that can be purchased at Walmart or even auto resale supply shops. Be sure to get the best grade. Never use a paper towel or the like that is used for general cleanup. To much rag and other pieces that can scratch.
If you use ordinary window cleaner that contain alcohol or ammonia based cleaners then you may actually strip away protective coatings and scratch or streak the display. I prefer inert or distilled water without any particulate. If you use an ordinary spray nozzle then you are apt to get to much cleaner on the display. You can use a micro-mister that will provide enough spray to clean the screen.
Never wipe a dry screen, you will just cause the dust to scratch the screen. When you do clean the screen, use a straight inline clean action. One direction as you progress down the screen. If you use a circular action you have more chance of scratches or pattern to the screen.
You can purchase cleaning kits but those can be expensive. I've purchased the microfiber for <$5.00 U.S. The water price varies$1.00 to $2.00 per gallon depending on type/grade.