Washing the veg & fruit only gets rid of contaminants on the surface of the veg/fruit. Most of that is what has been applied to the veg/fruit after it has been picked in order to preserve it.
I certainly would not be considering hydrogen peroxide, ozone or any other disinfectants. Hot water gets rid of most of the stuff applied after picking (such as waxes to citrus fruit, grapes, sultanas, raisins etc),and if I can, I prefer to buy 'dirty; veg that still has soil on it (if it is a root crop that is). Otherwise things like lettuce/celery just get rinsed in cold water.