I'm having the same issue, minus the standing water. We barely ever use the dishwasher, but when we do, it REEKS. I'm wondering if it's water backing up into the pipe, but not getting in the dishwasher itself? Maybe I'll try the baking soda thing.
The drain hose leading from the base of the dishwasher to the drain has a check-valve/flap that should prevent backwash. Often, these get gummed up and the drain-water with bits of food wash back into the drain pan of the dishwasher and rot.
Be sure to install the new hose with a "high loop". This means the hose should come up to a point above where it will drain into the sink drain, and should have a loop in it. This way, you will have no backwash from the sink, and the column of water in the hose will help to keep the check-valve closed when the dishwasher is not in use.
IF you ever buy a place, this is a home inspection item, and many (if not most) homes are missing it.
There's supposed to be a "high loop" on the drain hose from the dishwasher to the garbage disposal. It's supposed to be looped high near the base of the sink, rather than drop straight down from the garbage disposal. If it isn't looped high, then it will siphon waste water from the disposal back into the dishwasher. If it is looped high, it will draw air from the dishwasher into the disposal (along with any liquid) when the sink or disposal drains.
When we sold our house it was missing, and when we bought our new house it was missing. It's a $5 loop at Home Depot and most people can put it in themselves. You probably don't have to replace or unscrew the existing drain.
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Replace this hose.
http://www.partselect.com/dishwasher+replace-drain-hose+repair.htm
It should be cheap. Well under $20.
Be sure to install the new hose with a "high loop". This means the hose should come up to a point above where it will drain into the sink drain, and should have a loop in it. This way, you will have no backwash from the sink, and the column of water in the hose will help to keep the check-valve closed when the dishwasher is not in use.
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There's supposed to be a "high loop" on the drain hose from the dishwasher to the garbage disposal. It's supposed to be looped high near the base of the sink, rather than drop straight down from the garbage disposal. If it isn't looped high, then it will siphon waste water from the disposal back into the dishwasher. If it is looped high, it will draw air from the dishwasher into the disposal (along with any liquid) when the sink or disposal drains.
When we sold our house it was missing, and when we bought our new house it was missing. It's a $5 loop at Home Depot and most people can put it in themselves. You probably don't have to replace or unscrew the existing drain.
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