It was the rainx anti fog I used didn’t make my self clear I put it on a 100 dollar scope after the cat crap didn’t work very long to try it because on the bottle I had it said not for optics on it but it didn’t change anything that I could tell. David
When I got my Swarovski El Range, and Z5 scope I called Swarovski Customer Service to see what they recommended. The CS agent told me that they recommend "Parkers Perfect" Anti fog. It comes in individual packs that are easy to pack or stick one in your pocket. The packet contains a one-time use towelette that is easy to apply, and seems to work well.