I was just thinking a few days ago about what was the best cleaner to use for my sunglasses. Seems no matter how I try to clean them the lenses never get completely clean. Today I saw an ad for this product on the net. Then I went to youtube looking for some info videos of the product and here is one I found. I also looked on ebay and found it for $14.99 shipped so I will be placing an order shortly. I really hate wearing sunglasses with smudges on the lens,hopefully this will put an end to that.