Thanks for the comments. So the general consensus is that it shouldn’t be an issue using the Eclipse fluid with respect to the Q3 lens coating?
It’s annoying that even though I have used a UV filter out of the box from new, I somehow managed to get a small spec of dust on the lens, which turned out to be a small smudge when I wiped it. I have to say that a washed microfibres cloth did not help by introducing more dust particles onto the lens. 😐