Potatoes: Halved potatoes can remove rust from baking pans or tinware – follow with a salt scrub or dip the potato in salt before scrubbing.
White vinegar: Cleans linoleum floors and glass (from windows to shower doors) when mixed with water and a little liquid soap (Castile or vegetable). It cuts grease and removes stains, and removes soap scum and cleans toilets (add a bit of baking soda if you like). Pour down drains once a week for antibacterial cleaning. Add to water in a spray bottle to kill mold and mildew.
Tea tree oil: Can be added to vinegar/water solutions for its antibacterial properties. Use it to kill mold and mildew, and on kitchen and bathroom surfaces instead of chemical products. Add 50 drops to a bucket of water to clean countertops and tile floors.