I bought this to use on my camera trap lenses because when it rains or fogs up they sometimes fog up. This works well to prevent lens fogging. I don't know how long it's been going because we've only just started trying. The only problem with the product is that the instructions are so small that you need a magnifying glass to read them. Here are the instructions for those who don't have a magnifying glass: 1) Apply a few drops to the lens. 2) Spread on the surface. Lens gently with soft material. (I used my lens tissues to make sure they don't scratch) 3) Make sure the liquid completely covers the lens. 4) After at least 20 seconds, gently rub again with the dry part of the cloth to remove the streaks. 5) Breathe on the lens to see if areas are covered and repeat if parts are fogged up. I'll post more after we've used it for a while to tell how long it lasts.
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