Curious how do you go about cleaning the polycarbonate, mainly for hard water stains? The idea of using polycarbonate lids has been bouncing around in my head for a while now. The durability and the ability to cut them exactly to size are what stand out to me. I've already chipped and cracked a couple glass lids. Thing with them is I usually can just take things off with a razor blade, obviously not an option with the polycarbonate.Sorry about the rant. Glass lids are so expensive and fragile. I've gone through so many. Polycarbonate is so much cheaper and lasts forever. Easy to clean and as transparent as glass.