From what I have researched , both dish soaps and car wash products use the same surfactant(cleaning agent) . SLES (Sodium Lauryl Ether Sulphate), Dodecylbenzene sulphonic acid (neutralised with Sodium Hydroxide, Triethanolamine or Isopropanolamine). Concentrations will very. Dish soaps and car wash products will use different dyes and fragrances, some silicone emulsions or waxes for increased shine, mabye optical brighteners.The actual surfactants that do the cleaning will be the same,and they all use SALT TO BUMP UP THE VISCOSITY (thicken the product). Theres no such thing as a 'harsh' surfactant or a 'soft' one. " Harsh detergent" is marketing BS. No detergent is going to dissolve your acrylic clear coat. What causes more damage than anything is UV Degradation. Best advice I can give you is to use a product formulated for the specific task.