My Whirlpool dishwasher is only 2 years old and I started having the same problems. I dismantled everything I could and washed and scrubbed the entire unit with EVERYTHING..to no avail, dirty dishes!! But I discovered a remedy! Try using Lemi-Shine for about a week with your regular wash-soap. If you are using the tablet form of soap, stop and try the powdered form. Follow the instructions on the Lemi-Shine container. You can find it just about anywhere for around $3.50. I was within "5 seconds" of replacing my 2 year old Whirlpool dishwasher when this caught my eye and I figured why not try it too? After the first wash I noticed a big difference the cleanliness of the dishes..and now it is running GREAT after 2 weeks!
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Check your upper wash arm.... check the holes, especially the ones at the end of the arm. Are they possibly clogged with debris or hard water? This is the usual cause of dishes on the top rack not getting clean. The holes at the end of the wash arm are angled to eject the water at an angle to use the reaction to push the wash arm around. If those holes are clogged, then the arm won't rotate, and only those few dishes or glasses right under the arm will get clean, and the remaining 80% of the dishes on the upper rack won't get clean!
Possible that the motor impeller has good particles in it, causing poor water pressure, which would be most evident on the top rack. You would have to remove the spray arm, then the filter, then the torx screws to get at impeller....unfortunately, that model of dishwasher isn't the greatest in the first place for washing, since it only has the one spray arm.
There may be a couple of solutions to your problem. First, if you are not rinsing the dishes thoroughly before loading, your sump area in the bottom of the machine will get clogged, thus preventing enough velocity to reach top rack. Second, and most likely, your water inlet valve (or solenoid valve) is restricting. You have a timed fill mode through the timer and if the valve is not opening fully, you do not get the proper rate of flow into the machine. Replace the valve and your problem will most likely be solved.
spin the top rotary arm to make sure it spins freely also take it off to see if its blocked (run it under tap) check all other filters too and when you load dishes make sure they do not obstuct top rotary arm if none of this works then it's time for an engineer im affraid good luck