Flushing cooling system using dishwasher tablets

Back in the 80’s and into the early 90’s when I was a GM tech… we used powered laundry detergent typically Tide after a head gasket failure. The radiator and coolant bottle was like a brown milkshake.
Drain and flush a few times after removing the thermostat. Then add a cup of Tide. Refill with water and run for 20mins.
Flush and fill. Worked like a charm. It even worked well or better when the systems switched over to plastic radiators and pressure tanks (I forget the actual name for when over flow bottles we replaced and the new tank was actually part of the coolant system with a radiator cap.) The tide was the only stuff to clean all the garbage out of those. Never damaged or “etched” the aluminum. I don’t see how dishwasher tabs would hurt aluminum in that short of time. Some dishwasher parts are aluminum.
Syleng1