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Unable to clean means that the waste-ink "sponge" is full. If you've already checked for small paper part (which is very unlikely to cause this error message), the error is mechanical. Unfortunately, that's not something us users can change, but the machine would require to be sent to service. So if your machine is not within warranty, I'd doubt it'll be worth the service cost.
According to the manual, the unable to clean error means a mechanical problem or a foreign object in the machine:
Open the scanner cover and remove
any foreign obstacles inside the
machine. If the error message
continues, disconnect the machine
from the power source for several
minutes then reconnect it.