Sun expert gel
@Rolls_rapid: Yes, Sun expert gel's pearls are made of a bleaching agent and it's the only gel detergent to clean tea and other bleachable stains completely (Finish classic gel, which was the only dishwasher detergent still available to contain some chlorine, changed to a non-chlorine formulation at some point at the end of 2016). I gave it a try but it makes way too much foam in my Miele G562 and I passed it to my mom, who has a more recent Miele dishwasher and loved it so much that she's been using only that ever since. You mentioned you used Sun professional powder - I'm tempted to try it, did you get any good result in your machine?
BTW, I live in a hard-water area in Nothern Italy and refill the salt tank in my machine whenever needed, I use Pril phosphate-free tablets (the Italian name for Somat) and a phosphate-free, supermarket-brand powdered detergent made by McBride that my G562 seems to enjoy much better than tablets, and I always get excellent results!