When you're backpacking in the wilderness you tend to take even more of a minimalists approach to most things. Everything is about conserving weight. Fortunately, you really don't need much to wash dishes while camping. All you really need is treated water (your drinking water), biodegradable soap, a small sponge, and a towel to dry dishes. You won't have as much to clean either, just your cooking pot, utensils, bowl, and water bottles to clean out. It goes a lot faster than you think as well. Remember to have a sump hole dug away from your campsite and is 6 to 8 inches deep so you can dispose of the water. Using a square of the screen, mesh, or straining over the hole to catch larger food particles is ideal.