Do not waste your money on Parkers. I tried it for three weeks, fogged up every time, even followed their directions, no help. I have tried lots of stuff for years. Spent month bowhunting in September, tried something different and it actually worked every day. It is called "Viz Wiz" and is made by Birchwood/Casey. I will be using it again in two weeks. Used it on my Swaros and Zeiss optics. Worked great on both. Only draw back so far is it has a strong scent, not good for bowhunters. However I worked around that problem by putting it on at night. By morning scent was gone and it still lasted through out the entire day. Viz Wiz came in a small plastic spray container, 2 oz., and was an excellent cleaner as well. Found it in a sporting goods shop.
