Vintage powder, dishwasher detergent
Hi Ken, you could probably make your own by modifying modern detergent by adding some phosphates in a little bit a lye, Just go easy on the lye As it can very easily destroy rubber parts of the dishwasher. Old dishwasher detergents were very caustic and hard on dishes and dishwashers alike, which is why older dishwashers didn’t last very long when they were heavily used with good hot water. We used to see dishwashers only last four years or so before they were in really nasty shape. One family friend had three Westinghouse dishwashers in just 12 years starting in 1966.
John