It's worth noting that water alone isn't the best way to clean a technical pen. Commercially prepared cleaning solutions are available under Rotring and Koh-i-Noor brands. Clogged pens are best cleared by using the solution in an ultrasonic cleaner, such as jewelers use. Most tech pen inks are comprised of burnt carbon, water, and glue.
It's worth noting that water alone isn't the best way to clean a technical pen. Commercially prepared cleaning solutions are available under Rotring and Koh-i-Noor brands. Clogged pens are best cleared by using the solution in an ultrasonic cleaner, such as jewelers use. Most tech pen inks are comprised of burnt carbon, water, and glue.