We already know how useful citrus fruit can be as household cleaners, but the only thing easier than mixing citrus juice into a spray bottle would be using the fruit as the sponge. Conveniently, one whole grapefruit will clean your whole bathtub.
Not only does this trick save you from buying expensive, chemical-based cleaners, but you don't even need a sponge or bottle to mix it in. Just take a medium to large sized grapefruit, cut it in half, sprinkle on some kosher salt, and go to town. Using the grapefruit to scrub your bathtub (fixtures and all) will do a surprisingly good job of cleaning away dirt and grime, and when you're done all you need to do is rinse it out. Not only will it be sparkly clean, but it will smell pretty great too. Hit the link for step-by-step instructions, and let us know your favourite citrus cleaning tricks in the comments.