Using this OXO Good Grips salad dressing shaker is a piece of cake. First, take advantage of the wide top opening to add your ingredients. Use the measuring markers to pour in the right amount of liquid ingredients, then toss in any dry ones and flavorings. Next, give the bottle a good shake to mix everything well and emulsify the dressing, whether it's loose or thick. When you're ready to serve, just flip the top lever back and pour the dressing over your greens, toss, and enjoy. After you're done, flip the lever forward to seal the bottle. This keeps any leftover dressing fresh, and you can store it right in the shaker. As for maintenance, simply wash it with warm, soapy water after each use. Make sure to dry it thoroughly before using it again. And always keep it in a cool, dry place when not in use. Remember, don't use abrasive cleaners as they might damage the Tritan material of the shaker.