Me too. For years with no problems. I received a used 16-35mm Nikon lens yesterday from KEH... I wiped both ends with a Zeiss lens cleaner. The company has a history of-making glass with a variety of different specifications. I believe they know what they are doing.
Probably. Ive used Zeiss and Nikon, they both make similar products low cost at costco or amazon. I'd imagine they are all similar probably alcohol based, but I go with the camera and lens makers name brands just out of caution.