New Bosch DW - quiet and efficient. We love it.
We use tabs, which actually work really well at cleaning. Everything quite clean.
Soft water, treated well water, KCl. Clean and low minerals.
No spoting on glass, some water spoting on plastics
Some very slight soap residue if water puddles on items and sometimes on surfaces and with a clear clean glass fill with RO water, some slight soap type bubble. PROBLEM!
Tried the usual rinse aids, actually made the residue a bit worse. At best a waste of money.
So we put the detergent tab right in, not in the timer cup. Helps!!
Then we took a next step. We drop the detergent tab in bottom to start and put citric acid (1 tablespoon) in the timer cup. WHAMMO problem solved!
So I bought a 5 pound bag of citric acid (food grade) , transferred some to jar next to the tabs. Been doing this for a few weeks and everything that cycles is quite nice, no residue, nothing.
Everybody has different water and machines and soap, etc but this worked for us. Give this a shot if you don't want to buy a rinse aid which I knew ended up going in my body.
Also we never run aluminum in the DW (which detergent is hard on anyway).