Pre-rinsed dishes come out with food residue as if it is backing up from the sink into the dishwasher. I've run the disposal and left water running to flush the pipes. I've cleaned out the bottom of the dishwasher and rerun to no avail.

Two things can cause this problem:
1. The check valve in your dishwasher may be defective, allowing water and food debris to seep (or run) back into your dishwasher.
2. Your drain hose may not be "mounted up" the way it should be. Look under your sink. Look at how your drain hose is connected to your garbage disposal. If the hose runs down to the floor of your cabinet and into your dishwasher, that is wrong. Instead, it should be mounted up so that water from the sink and garbage disposal would have to flow up first to get into the dishwasher. If you do this, then even if you have a bad check-valve in the dishwasher, it will prevent the problem (or greatly reduce the problem) of dirty water flowing back into your dishwasher.

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My best advise is to reduce the amount of detergent to the least amount that you can use, and still get the dishes clean. We do rinse the dishes a bit, as the soft food disposer isn't made to act like a garbage disposer, but rather, to catch incidental food residues. We no longer fill the closed detergent dispenser. We sprinkle about 1/2 of the normal amount (that goes in the open cup) on the inside door and close it up. Our dishes get very clean, with no residue. Also, use a good drying agent as this will help sheet the water off of the dishes. It may take several cycles to see improvements, but you should see improvements nonetheless.
Best regards, --W/D--

From Whirlpool:

*Film is due to either etching or silica film. Silica film is a milky, rainbow-colored deposit and etching is a cloudy film. Sometimes there is a water/chemical reaction with certain types of glassware.
o Silica film and etching are permanent and cannot be removed. Both can occur in any automatic dish washing machine and result from a water/chemical reaction with certain types of glassware. They are caused by some combination of:
+Soft or softened water.
+Alkaline washing solution.
+Insufficient rinsing.
+Dishwasher overloading.
+Heat of drying.
+Long/hot cycles.

To slow the down this process:

*Use a minimum amount of detergent but not less than 1 tablespoon per load.
*Use a liquid rinse aid.
*Under load the dishwasher to allow thorough rinsing.
*Do not use heated drying.
*Wash glasses by hand.

Do the following:

1. do you use a rinse agent
2. clean out the drain.
3. if you have a food disposal, run hot water through it and turn it on to clear it out before you turn on the dishwasher. The dishwasher drains into that sink. If you notice food or dirty water backing up into you sink when the dishwasher is draining, then the sink could have a minor clog and is backing up and being re-sprayed onto your dishes.
Source(s):
Use SANIVAC to clean lime deposits and extend the life of your dishwasher. If you have heavy water.

Run your dishwasher empty and pour in a cup of bleach and a cup of white vinegar to get the residue out.....run a regular cycle.......How hot is your hot water tank set on? The hotter the water the better a dishwasher washes and rinses, be careful it's not to hot as your shower and other sinks also will get this hot water......cut your dish soap down and make sure to use a Jet Rinse Aid. Again, be sure to use a liquid soap, and rinse agent, powders will cause a caustic reaction. Hope this helps. Let me know if there is anything else I can help you with.
JimmyC

Check your sprayer arm holes for food clogs. You can use a toothpic to clean them

Check your hot water supply. It should be at least 125 degrees. Are the dishes spotty or still dirty with old food? Try to pre-rinse your dishes before putting them into the dishwasher. You can also run your hot water until it's nice and hot coming from the sink before turning your dishwasher on. If they're spotty, use less or better quality detergent. My guess is going to be water temperature or pressure.

the dishwasher drain line must be elevated above the disposal.

if drain is in proper position check the "p" trap under the sink for a blockage.

The filter systems on the Maytag line of dishwashers which includes Jenn Air is very fine. In most causes the pump needs to be torn down and washed in a sink and a shop vac is also a great tool I use to clean the rest of the pump out that will actually stay in the dishwasher. The spray arms also need to be cleaned in the sink. Check your drain line under your sink as well and make sure that the drain line coming from the dishwasher has a high arch or bend that is higher than the base of the sink. This will prevent sink water from backing up in the dishwasher which can be nasty. Also make sure to run your hot water to the sink before starting a cycle to assure hot fills and the water temp. is best if set at 130 degrees on your water heater instead of 120 or 125 degrees. I hope this is helpful. This kind of problem can be agrivating to solve at times. Scott (North Caolina)

The drain hose is supposed to go from the garbage disposal to a high point under the sink in back to keep the water from gravity draining into the dishwasher when it shuts off. If you look you will see that the hose is laying on the bottom of the sink cabinet. Get a hook and wire it up so you're not washing dishes with water from the disposer. Be sure to run the disposer. if it is clogged with food the dishwasher will not drain, water will back up and drain back into the dishwasher. Also make sure that the pipe exiting the disposer isn't clogged and draining slowly. hhe best solution is to have an air gap that mounts on the sink. It goes between the washer and the disposer to keep this from happening.

You do not have to take it apart to clean it. You can run it a couple of times with dishwasher tablet and it will self clean. In general I recommend rinsing the food off of the dishes and silverware before placing items into the dishwasher. Also, run the hot water in the sink until it gets hot and then turn on the dishwasher. good luck with it.

Dishwashers work best when the following "rules" are followed.

1. Rinse food off of the dishes before you place them in the dishwasher.

2. Face plates toward the center and do not over crowd them.

3. Always put glasses on the top shelf and always put plates on the bottom.

4. Run the hot water in the sink until it is as hot as it will get before you start the dishwasher.

5. If your dishwasher has a pot scrubber cycle use it and it will make a difference.

Doing these things should solve your problem. If not, let me know.