The soap manufacturing process is quite different from that of detergent making. Here are the differences between soap and detergent and how they are made: Soap: • Soaps are detergents that contain natural ingredients, such as oils and fats. • Ingredients are not too harsh. • Biodegradable. • Keeps plant life protected. Detergent: • Contain synthetic chemicals for specific uses. • Synthetic chemicals are harsher. • Not too eco-friendly. • Used for killing mold and could be destructive for grasses and other green beings. Thus, based on the purpose you want the car wash products for, you should choose the best car wash soap for pressure washer or best detergent for the same. Thus, be careful and make the correct choice for your car or pickup truck.