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We have the same Whirlpool dishwasher - and I think I know the cause of the problem (I'm just not sure how to fix it). The dishwasher top rack can be moved up and down, giving the dishwasher flexibility to fit larger dishes on the bottom or top depending if you have the top shelf "High" or "low." I really like this feature, but it appears this is the problem why our dishes are not getting clean on the top shelf. The "plugs" on the inside back wall of the dishwasher no longer make a seal (in fact one is missing) so when the water rushes up to the middle and top arms, the water sprays out through the unsealed hole creating a serious lack of water pressure. So now I just need to find out if I can easily buy and replace the little one-way sealing valves on the back inside of the dishwasher wall (where the middle arm plugs in, when you push the rack all the way).... after all, I am not "Mr. Fix it." I hope this helps.