1) Lemons
Shine brass, remove linen stains, and counter tops with these anti-bacterial and antiseptic properties. It's most effective as an essential oil for general cleaning and laundry.
2) Vinegar
Distilled white vinegar, if you can handle the smell, is a very effective all-purpose cleaning, except for marble. It removes stains, cuts through grease, deodorizes odors, and is biodegradable, so it's great for outdoor cleaning.
3) Banana Peels
You can polish your silver and your leather furniture with banana peels, then you can soak them in water in a bottle to make vinegar, which you can use for an all-purpose cleaner.
4) Vodka
This makes a great all purpose cleaner, according to http://theselfsufficientliving.com/foods-that-can-clean-your-house/, but it's an expensive solution!
5) Salt
With salt, you can clean your refrigerator, coffee pots, and even rust. Check out this list of 37 Smart Uses Of Salt For Non-Toxic Cleaning Purposes here.