Marty sent me this photo:
The plan was to come print her birthday card in a creamsicle color. However, because the previous user didn't fully clean up, the creamsicle ink came out looking ochre (the lower print)! After a cleaning, she got the desired color (the upper print).
So the tip is to always fully clean the rollers! And if you're printing in an especially bright (or light) color, you might want to consider doing a check and a preventive cleaning, just in case. But, let's all try to fully clean up after ourselves each time we print. Remember, the golden rule... you wouldn't want someone to leave a dirty press for you, would you?