Reddit mentions of KOH-I-NOOR Liquid Eraser 3/4 oz Bottle No 291-F (291F) by Koh-I-Noor

OK. First, air might do the trick. most people have something like this:

https://www.amazon.com/Koh-I-Noor-Pressure-including-Rapido-EzeCleaning-3068SYKT/dp/B004BNNKOU/ref=sr_1_3?keywords=koh-i-noor+ultrasonic+cleaner&qid=1559156384&s=gateway&sr=8-3

It's just a small air bladder that pushes air through a syringe end. This should clear most of the ink from your nib while it's still wet. The kit I linked has a small amount of nib cleaner.

If the ink dries, you want to use water first. If that doesn't work, there is Rapido-eze. You want to follow the dilution directions and use small syringes designed to clean these pens.

https://www.amazon.com/Koh-I-Noor-Rapido-Eze-Cleaning-Solution-30684-x/dp/B000KNNI24

Second, you can put the solution in an ultrasonic cleaner and do that. i don't do this every day with mine if I'm doing something over a weekend or something. Only if the nib refuses to cooperate, or i've been going at it for over 10 hours with a particular nib. Any ultrasonic cleaner for jewelry will work. You can get them cheap off amazon or ebay.

Some people just use a hint of dish soap instead of the cleaning solution. YMMV.

​

Also, I saw somewhere else you just incorporate a mistake. You don't need to with this stuff. Just put some on a q-tip and lightly blot the ink and it should come off the mylar.

https://www.amazon.com/KOH-I-NOOR-Liquid-Eraser-Bottle-Koh-I-Noor/dp/B01AVOC6HY/ref=sr_1_54?keywords=koh-i-noor+eraser&qid=1559156230&s=gateway&sr=8-54