It isn’t really about germs so much, although that’s a factor. Rather many fruits and vegetables have dirt in them or on them, as in actual soil, insects, pesticides, or waxes applied to them for preservation. Washing removes these.
If you look at something like leeks, you really need to get in there or you can end up with some soil in your meal. By contrast berries are often pretty clean, but heavily treated with pesticides, and something like an apple is almost always waxed.
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