how to clean these old rotring ? , they are clogged on the inside and i have no idea how to clean them (one has fungus inside or smt) . : r/rOtring
Amazon.com: Rotring Isograph Technical Drawing Pens, Set, 3-Pen College Set (.20-70 mm) : Everything Else
Pen Cleaning Fluid
rOtring pen cleaning unit. Can fit 4 isograph nibs or variant style sections and 4 rapidograph nibs or other variant style nibs. Very usefull and safe for loosening dried up ink : r/rOtring
How to clean and wash isograph Rotring. Global Drawing Club - YouTube