Using your Rig-Tig Mix-It Mixing Bowls is a breeze. First, pick the right size bowl for your task - the 1.5 L for smaller jobs, the 2.5 L for medium - sized recipes, and the 3.5 L for larger batches. When pouring ingredients, use the unique top - edge design to pour from any side you like. The measuring units inside the bowl will help you add the right amount of each ingredient. When you're done, simply put on the see - through lid. It's easy to place on and lift off. For cleaning, you can wash the bowls and lids in the dishwasher. But remember, because the bowls are made of melamine and the lids of PP plastic, avoid using abrasive cleaners as they might damage the surface. Also, keep them away from extreme heat sources. If you're not satisfied with your purchase, you can return the item within 30 days as per our return policy.