Along with Rain-X Anti-Fog, Comma stands out from the rest of our test samples - the two must share similar magic ingredients! Despite our best efforts, this product kept our glass completely clear. But on top of that, it's also very simple to apply - and this is where the ProVision scores over the Rain-X. The nanowipe cloth thrown in makes pre-cleaning an absolute doddle. What's more, the product's gel-like formula is easily spread and goes much further than you would expect it to. So Comma noses in front, and is a worthy Best Buy.