When choosing a detergent for your foam cannon, it's important to consider the ingredients. Some common ingredients in car wash soap are sodium lauryl sulfate, petroleum distillates, and d-limonene. Sodium lauryl sulfate is a surfactant that helps remove dirt and grime from surfaces. Petroleum distillates are used as solvents to dissolve grease and oil. D-limonene is an organic compound that gives soap its citrus smell.
Some car wash soaps are designed specifically for use in foam cannons. These products typically have a high foaming action and can be applied directly to the vehicle with the cannon. Other car wash soaps can be used in foam cannons, but may not produce as much foam or may require dilution with water before use.