Originally Posted by markmon1
Also, there appears to be some sticky stuff on the lens. Oddly enough it doesn't seem to impact the picture, but I'd like to clean it off anyway. Whats the proper way to do this without scratching the lens?
So, I have been down this road recently and I found something that works well for me after trying a number of things.
First and foremost, try a few good drops of dish soap and water, if that doesn't work, you can try this to get really stubborn stains off, then finish with the dish soap.
I bought 99.99% pure isopropyl alcohol and also some distilled water and made a 70/30 mix from the two into a new little spray bottle.
Bought some 100% cotton wool balls which you can find in any supermarket or pharmacy.
Spray a very light mist of the mixture on the cotton wool ball so its super slightly damp (not saturated) and wipe lightly in a circular motion going from inside to outside the lens. Don't be afraid to do it a number of times and go through a ton of cotton balls if the lens is really dirty. These things are so darn soft they will do no harm at all to your lens.
People will say you are better off just using your breath to kinda mist the lens surface which is probably true then wipe, but when ive done that or used pure distilled water ive seen water marks left over and almost an oily sheen on the lens which is only really visible if you hit it with a flashlight at an angle, but still there. The mix with iso alcohol means as you are lightly wiping, it will evaporate and you will pretty much suddenly see the glass just go absolutely crystal clear. I also found I needed the iso to get a really light layer of 'oily film' off the lens on my 9500 which water just wasn't doing.
I did find when I revisited this that if I did it one more final time with dish soap and water at the end, it was a better and more clear result than just the Iso mix. I think this is because the dish soap and water is a more PH neutral solution rather than pretty aggressive alcohol.
I keep a lens rocket blower around too if there are any fibres left over one blow with that and they are gone.
I really wish somebody would develop an anti-static lens coating for projectors which actually worked. I also thought about using an Ion Gun for Turntables to make dust just drop off but apparently it doesnt work.