The cleaning cartridge is, according to the instructions, used about every three months and is suitable for all Montblanc cartridge pens except the Meisterstück Traveller. After pumping, on release a suction arises that draws some ink from the nib unit into the cartridge; that is normal, since the cleaning fluid first has to soften and dissolve the old ink. With heavily dried ink, multiple flushing with water can additionally be necessary. The first generation of cleaning cartridges was meanwhile withdrawn from sale, since the mixture of the cleaning fluid had to be revised.