Why aren't my dishes getting clean, and what should I do?
Common causes and solutions include: ensure spray arm movement is not blocked and rotate them manually before starting; clean spray arm nozzles if clogged; check that you're using the correct amount of detergent for your water hardness (refer to Table 1); clean the filters which may be clogged; rearrange the load so water spray reaches all items and dishes are not nested; and select the appropriate wash cycle for the level of food soil. If dishes still are not clean enough, refer to the detailed troubleshooting section in the Self Help section of the manual.
From the official Bosch E15 Dishwasher manual, page 17
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