Tub and shower cleaner, y'all! I love vinegar for everything. Saw this on Pinterest, and just about everyone I know pinned it. My Aunt Jane tried it first, so I had to join in. Half dish detergent, half vinegar poured into a squirt bottle. Easy enough.
Link to cleaning recipe: http://www.food.com/recipe/tub-and-s%20hower-magic-434275