We recommend washing at least everything on the so-called “Dirty Dozen” list with the device. These include strawberries, nectarines, apples, grapes, bell peppers, cherries, peaches, pears, celery, and tomatoes. For fruits and vegetables on the “Clean Fifteen” list or those that are organic, a thorough rinse under the faucet is sufficient. There’s no point in cleaning fruits and vegetables with thick skins, such as bananas, oranges, kiwis, onions, mangoes, pineapples, melons, or avocados. The device is only suitable for whole (leafy) vegetables and fruits. It’s best to peel conventional potatoes; they don’t need to be treated with the AquaPure . We recommend eating organic potatoes with the skin on. You can treat them, but it isn’t strictly necessary if you scrub them thoroughly under the faucet with a brush beforehand. Mushrooms can absorb moisture, so we advise against treating them. Mushrooms, incidentally, are on the “Clean Fifteen” list, so it’s not strictly necessary to wash them thoroughly.