My fairly new dishwasher smelt sour for months. Cleaned it, pre-rinsed dishes, checked position of supply hose, changed detergent. All to no avail. In frustration, I opened the drain by removing all the screws,etc. I found a peice of plastic that may have been blocking the drainage AND changed the cycle to 'sanitize'. I have not had a problem since. Not sure which change fixed it. ..
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