With all the car wash soaps out there, both over-the-counter and "boutique" types, I still like Megs Professional No.62 Wash Conditioner, but it`s cost is about 3 times the Gold Class, SO it may not fit into your financial budget of a cost-effective car wash soap. it`s an exceptional wash for maintenance car wash cleaning via the 2-bucket method. The best "value" is 3D`s Pink Car Wash in a 5-gallon pail. I would not use clothing soap due to its lack of lubrication; great for cleaning off dirt, BUT terrible for car finishes. Some have used Dawn Dish Soap with its cleaning ability, but again it`s lack of lubrication has been the subject of debate within this forum. Improper washing and drying techniques or improper or dirty wash and drying media are the main reason many vehicles have the dreaded swirls that are the bane (highly disliked by) of every detailer. Proper (AKA good) car wash soap is just part of that equation.