We do this every few months; When your dishwasher doesn't clean well, fix it yourself following these simple steps and avoid the expensive professional service call. A simple cleaning often solves the problem.
This is AWESOME! It's cheap and easy, and it works like a charm. Wish I had a before picture of my tub. It had the nasty pink/orange crud all over--- scrubbing bubbles cleaner couldn't even cut through it! But the vinegar and dish soap did the trick. It's so clean now. :-)