Dr. Bronner's makes a wonderful wash for produce, too, at huge savings over what you will pay in a natural foods store. Just dilute about 7 parts water to one part soap and put in a spray bottle. I've been using this for many years as a produce wash, with very good results. It rinses completely and doesn't leave a soapy taste.
It may also be the ultimate camping product. It washes dishes, clothes, dogs, and people out of one little bottle. Just remember to dilute!!