Well I do think we should be washing fruit and veg before we consume it. Most of it contains pesticide residues and grapes are no exception. In some orchards, apples are sprayed with pesticides more than twenty times before harvesting. I even wash oranges, clementines and lemons before using them. They are treated with fungicides so that they won't rot as quickly on the shelves. I make an exception for mushrooms because washing ruins them, but I would never eat them raw. Any growing medium left on them gets brushed off with my thumb. Some crops are grown in soil fertilised with treated sewage sludge.