I have one too. Prints very nice (bought it mainly to print photos at home), ink consumption is minimal. But the pritnt head carriage started to be dirty with

I have one too. Prints very nice (bought it mainly to print photos at home), ink consumption is minimal. But the pritnt head carriage started to be dirty with ink and leaving dark smudges on the paper. The cleaning pad is soaked with ink. It is not user-replaceable. The waste ink container is nearly empty (less than 1/4). From time to time I have to suck out the excess ink with paper towels and clean the head carriage. Maybe I do not use it frequenly enough to pump the waste ink to the container? I'm just guessing, based on the ink pad and waste container position and hose routing it can't be gravity based. There may be some kind of peristaltic pump powered by the paper feed axle (as it rotates the paper feed rollers vigorously during self-cleaning)