To unclog drain, remove standing water, pour 1 cup baking soda down drain then pour 1 cup vinegar in and cover - let sit for 20-30 minutes then pour pan of boiling water into the drain slowly. This really works!
Add orange peels (or any citrus peel) to a quart of white vinegar in a closed container and let it set for two weeks. Combine citrus/vinegar solution half/half with water and use for cleaning. Works on floors, tile, fixtures, etc. Smells good and is tough on scum! Best of all there are no chemicals.