I also wanted to add, I live in a farming community where we grow a lot of the everyday foods everyone in this thread would eat. While I am not a farmer myself I know there are restrictions (at least in NSW) about what they spray with, concentration levels etc. These people are not going to ruin their livelihoods and risk the farm that has been in the family for 4 generations to sell you food that is going to kill you. Everything I have read is that a quick wash under water is all that is needed.
If there are any risks it's the overseas fruit and veg.