I am having a problem with my dishes in my dishwasher. They seem to continue to come out with a white film on them. We have cleaned out the washer with vinegar, and have changed the soap we were using. Nothing seems to help, and the film will not come off the dishes. I have had to throw many away. We also have a water softner, that we have back flushed according to the manufactures instructions and still no change. Any suggestions?