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Yes, the Pancro Professional Lens Cleaner can be applied to a q-tip and the wet q-tip can be used to clean Nikon Z8 eyepiece glass.

Yes it works great in iPad or smartphone screens

While I have not personally used the Pancro Professional Lens Cleaner, the lens cleaning solution was rated the best lens cleaning solution at the Camera Assistant Olympics. I personally use and recommend Residual Oil Remover (ROR), but I do plan to try the Pancro Professional Lens Cleaner and I expect both to be very competent in cleaning multi-coated optical glass with little to no residue.

Pancro Professional Lens Cleaner and all other lens cleaners we sell make no mention about cleaning watches. It would be recommended to check with the watch maker or a jeweler for advice.

There is no shelf life specified for the Pancro Professional Lens Cleaner.

Yes, it is nothing but IPA, albeit it may be reagent grade, which means very pure. Some vendors add useless Bitrex to stop people from abusing the IPA (drinking), but in reality you would get sick from the IPA before tasting the Bitrex, so useless. However Bitrex may stay behind potentially causing streaking. By the very nature of the 'alcohol', if theoretically pure, it will absorb moisture from the atmosphere lowering the concentration from 99% pue. So there will always be waterin the product.

You can use this on an LCD screen, but it's recommended to spray it on the cleaning cloth you're using rather than directly on the screen.