I live in an apartment in an area with VERY hard water. My shower is white fiberglass. I hated using my shower I never felt clean coming after a shower because the walls and floor of the shower were coated with soap scum and hard water deposits. I've tried so many different products but I always had to scrub and scrub the tub to get anything off. I don't want to use a scrub brush because it will scratch the fiberglass. I've used Scrubbing Bubbles for years but it never quite cut the soap scum. I bought the Mega Shower Foamer with a coupon while it was on sale. But I really didn't think the price...