I will show you how to clean a fountain pen with iron gall ink stains. http://iron-gallink.blogspot.jp/2013/11/cleaning-method-for-iron-gall-ink-using.html I already wrote this method in the Japanese fountain pen magazine (Shumi no Bungu-bako vol.16 and vol.23). It is very easy, inexpensive and effective method. Please try it . Thank you for your attention.