My last tv I won at work over 10 years ago. Now I have myself a new TV. yay.... Ok, here's the deal. I bought the tv used. The tv was origianlly shipped to best buy. It was recieved with a cracked screen. The guy I bought it from bought it and replaced the screen with a brand new screen. I bought it from him. TV was never used before. Brand new bulb..etc. (as far as I know) Ok, I went and bought it and it was in his garage. Looked really good. Great picture etc. Nothing wrong with it. I brought it home and now there's a dark spot on the screen. So I do a search. I read about it being dust and the tv was apart in this guys garage for quite a while so it is believable that it's dust. I go out and buy some compressed air. Take the bulb out... blow it off. Take the access panels off the side and blow off the inside as good as I can. Same dark spot is there. Question: How close to the mirror do you have to be to blow the dust off? The nozle of the compressed air is 12" away at least. Reason being I don't want the compressed air to 'put' anything on the lens. ( you know how if you tilt the compressed air bottle the white stuff comes out ... I don't want to get that on the lens) Sooo... looking at the lens inside it looks like there's quite a bit of dust on it. Little flakes of dust... nothing big. Should I hit it again with the compressed air but only from a closer distance. Or is it ok to get a lense-cleaning type towel and brush off the mirror? Any help appreciated. Thanks in advance.