Buy boxes and boxes of TSP (tri-sodium-phosphate) at Home Depot, Lowes, local hardware stores.
I don’t know how to mix it with non-phosphate products, but that’s the phosphate that will soon be missing from damned near everything.
I’m wondering about Boraxo ... I don’t have any to check but was wondering ...
I did check at Home Depot tonight. There still is one brand of true TSP there (for now), but all the others are TSP substitute. I don’t know if the substitute products would do any good in the dishwasher nor if they would be safe.