If you are tent/car camping this is one of the most effective method to clean dishes (when camping with family and friends).
This method uses very little water to clean the dishes so you do not have to worry about carrying too much water with you.
If you are dry camping this method will be the best for you to clean dishes with no water (well, you will need a tiny bit, but that's it).
When washing dishes in bear country make sure not to leave food trail. Wash dishes 100 meters away from your campsite and keep your food in bear-proof canister.