Avoid Sailor Jentle Tokiwa Matsu and yama dori, and Diamine Royal blue. They stain.
I know Pilot Ka-Jaku was hard to clean out. I had to soak in pen flush over night to remove it's stains, but it did come clean. On those inks did you try more then water to get the stains out?
Edited by Driften, 01 July 2018 - 16:12.