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I have a .10 rapidograph which is clogged for several months. I tried to put it in the water for several hours and I can now hear the little bill when I shake it. I changed the cartridge and shook it like crazy but it still does work...

1/ Do you think I should try again using the rotring cleaning fluid ?

2/ If it doesn't work, do you know if one is easier to unclog than the other between isograph and rapidograph ?

Thank you