Tub Cleaner - vinegar and dish soap, no scrubbing! Heat 1/2C white vinegar in m'wave for 90 sec, pour int spray bottle. Add 1/2C BLUE Dawn dish soap. Shake gently to mix. Spray on surface, let it sit 1-2 hours. Just wipe it away then rinse with water. Should also take soap scum off shower doors! @Jess Pearl Liu Allen
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.