Here's my suggestion:
I have a 55" Philips HDTV and I live in an area known for excessive dust and more than a fair share of spiders.
I checked online and found that there are usually 1-4 access panels that can be removed for cleaning, repair, etc.
Here are my steps:
1. Remove the upper most panel (usually a trapezoid-shaped plastic "box"). There are anywhere from 1-4 "hangers" that, once all the screws are removed, will hold the panel in place while you are unscrewing the last few screws.
2. Remove the panel and clean with a lint-free cloth the entire inside of the panel. This is an area where a lot of dust and spider webs can be found.
3. Grab your vacuum cleaner and carefully clean away all the spider webs. Making sure you don't bump into the inside of the projector screen!
4. Spray a small amount of dust cleaner or window cleaner on the lint-free cloth and run the entire length of the TV. Clean all surfaces this way except the reflector (mirror). It is best to clean the mirror with compressed air (get it anywhere - usually in the computer section).
5. Using a flashlight or bare lightbulb, thoroughly inspect all surfaces for dust and spiderwebs. And, of course, clean anything missed the first time around.
6. Using a clean lint-free cloth (I find cotton underwear from Wal-Mart works the best), spray a very small amount of window cleaner (streak-free Windex, etc.) on the cloth and rub the cloth together until almost dry. Then, simply wipe all three lenses clean.
7. Replace the back panel and pay close attention to the alignment of the holes to ensure the screw goes back in the same way it came (if not, the panel could ultimately lose the seal and allow for more dust).
8. Allow for several minutes drying time before turning the set back on.
1. Clean the speaker area, too.
2. Repeat the process at least each 30 - 45 days to ensure optimal performance.
3. Use a small computer fan to circulate air behind the set if the area gathers excessive dust. They're quiet and can be purchased (almost anywhere - Radio Shack, Wal-Mart, etc.)with switches that are easily accessible.