Keep a clean campsite Pack out your trash, recycle it whenever possible, and go the extra distance to clean up after less thoughtful visitors. No one wants to camp where someone has left trash and human waste, and creating a new campsite can stress the environment. Carry plastic bags in your vehicle and pack out all trash if garbage collection is not available. The introduction of mud, soap, sunscreen, bike lubricants, and oils can pollute water sources that are critical for animals. Carry wash water away from the source, dispose of dirty water in a small hole, and cover it with dirt.
Biodegradable soaps are most effective when rinsed off on land where soil bacteria can degrade it.
If you made room in your fanny pack or vehicle to bring stuff in with you, then you certainly have the means to pack it out. These items do not decompose readily. Carry a garbage bag in your vehicle for camp waste. Human Waste Bears do it, cows do it, and soon enough you'll have to do it. Tissue paper should be packed out.