you can use ISO15883 (parts 1,2,3,4,5,6). It treats about PQ dishwasher.
I think 2 tests can be used : Soiltest or Riboflavin for QP water aspersion.
Others tests : TOSI, STF-LoadCheck, PureCheck A, WashChecks and WashCheck H
Actually, I’m trying to look about riboflavin test in dishwashing but it is rarely performed.
You have to create your protocol.