Tub and Shower Magic from Food.com: This came from an Everyday Cheapskate e-mail and it is truly magic as the title states. I just tried it and it got the soap scum off my glass shower door with hardly any scrubbing. It was amazing as I have tried to clean that door with various products. It is so easy, too. Try it and you will be sold. Be careful because a little bit goes a long way. You need a 24 oz squirt bottle for this.