Ed, no need to apologize. For car wash detergent, look for a pH-neutral car shampoo rather than dish soap, since dish soap can strip wax. I'd check the detailing aisle at a local auto parts store and read the dilution ratios on the back. Foam cannon users often prefer a shampoo that foams well at low concentration. As for the oil debate, that YouTube recommendation is worth a watch, but keep in mind detergent choice and wash technique matter more than brand loyalty for avoiding swirls.