Vinegar works well too...any astringent like these will strip the pesticides off the foods so we can enjoy them. Allergies is another matter. Many food companies put dyes in our foods to make them look like real food when in fact they aren't because they have striped everything from them. That is why your son and many children have problems with what's on the market these days. I love to make jam/jelly and those type of things when I have the time. Much better than what is on the market.