Is Gyeon Q²M Foam the thickest, best performing, snow foam ever? Quite possibly yes! It's no secret that this product took Gyeon a long time to develop and perfect; despite pressure from the detailing community to release it as soon as possible, Gyeon held their nerve and continued to test and revise the formula until they could improve it no further. And, based on our experiences with it, this effort has paid off. Firstly, how well does it foam up? The answer is better than any other snow foam we've ever used (assuming that the correct dilution ratio/range is adhered to), and this does not appear to be affected by water hardness (which cannot be said for rival products, which tend to produce less foam in hard water areas). Gyeon Q²M Foam produces a ridiculous amount of thick clinging foam, which is great, because this maximises its dwelling time, even on slick well protected finishes. Secondly, how well does it clean? The answer is very well. We regularly rely on it to remove many weeks' worth of salty winter grime without any help from a pre-wash grime remover, and it does this with ease. Sure, the usual grimy film remains afterwards (that only a hand wash will ever fully remove), but the main bulk of the dirt and grime is always fully removed. As such, it's every bit as good as (if not better than) its rivals, but offers marginally better foaming performance in hard water areas. All in all, Gyeon Q²M Foam is another awesome product in the outstanding Gyeon line up.