Dishwasher leaves baked on soap scum on al dishes and everything ....even on the dishwasher ...tried all kinds of soap and rinse aid...nothing works...cleaned entire washer out cleaned all filters...
I imagine you've already checked that you're using the correct amount
of detergent for the wash programme, and that you're washing the
correct quantity of dishes for the wash programme, though if not, try that first!
Is the dishwasher heating the water to the correct temperature? If it's not rinsing at a hot enough temperature, the detergent may leave a residue. In that case, your dishes would probably also be less than entirely clean; they could be slightly greasy when removed from the machine.
Another possibility is that insufficient water is supplied to the dishwasher, so it might be worth checking the tap that lets water through the hose and into the machine. Does the tap turn on fully? Does it turn off properly?
The other thing that might be worth trying is an empty wash: put the machine through a wash programme WITH detergent but WITHOUT dishes, at the programme with the highest temperature. Is all the soap scum washed away? Or is there still a residue inside the machine? If the empty wash works, you probably need to give your machine a maintenance wash once a month or so. This is often the case if you usually wash your dishes a few at a time on a short programme.
I hope some of that helps. Good luck!