For fruit and veggies, soak them in a ratio of vinegar and water to help remove toxins and pesticides. OK leave them soaking for up to an hour, longer with non-organic apples. It doesn't change the taste. Keeps in the fridge longer too.
No outdoor space? No green thumb? Not much sunshine? No problem. You can still easily grow your own bean sprouts. The process feels more like food prepping than gardening, which I think is key to not screwing it up either. All you need are beans, a jar, some cheesecloth, a rubber band, and water.