We recommend taking at least everything from the so-called Dirty Dozen wash with the device. These include strawberries, nectarines, apples, grapes, peppers, cherries, peaches, pears, celery and tomatoes. For fruit and vegetables in the Clean Fifteen or what is organic, rinsing well under the tap will suffice. There is no point cleaning crops with thick skin, such as a banana, orange, kiwi, onion, mango, pineapple, melon or avocado. The appliance is only suitable for whole (leafy) fruits and vegetables. Regular potatoes are better peeled, they do not need to be treated with the AquaPure. We recommend eating organic potatoes with skin. You can treat these, but you don't necessarily have to if you use a brush rinse well under the tap beforehand. Mushrooms can absorb moisture, so the advice is not to treat them. Mushrooms, by the way, are in the Clean Fifteen, so it is not strictly necessary to wash them thoroughly.