"If I could only use one item to clean with, it would be vinegar," says Sharp. A natural disinfectant and “cheap as dirt," vinegar deals with stains, grease and mold — especially in the shower. "I've cleaned my whole house with just a spray bottle of vinegar and a little liquid soap," she adds. To make it smell good, she adds a few drops of calming lavender oil (also a natural disinfectant), which you can find for less than $10 at local health-food stores. Just remember, you're not making gallons, you're making a small bottle. Because they contain no preservatives, DIY cleaning mixes don’t last very long.