There Are Pandas, and Then There Are Pandas.
And this isn't either of them! The Pandas we're talking about here, are watches, not bears. And what got me thinking about them (again) was a link posted this morning by @cm.rook who pointed a few of us to the very attractive (and not terribly priced) Yema "Rallygraph" Panda which, in it's most traditional arrangement, looks like the one on the left, but can also be had in the version on the right: The model on the left is a true Panda, while the model on the right is called a reverse Panda. The reason for that distinction is clear--Panda bears, only come in the first arrangement. Now at this point, everyone should be thinking about the most well-know Panda, The Rolex Panda, which is actually a Daytona, and among Rolex Daytonas, the most famous of which is the Paul Newman Daytona, which was famous first, because it was Paul's, and second because it sold at auction for $17.8 million (US Dollars). The story of that auction is well-known so I'll only...
Nov 8, 2019
I have a sonic cleaner (add a few drops of dish soap and/or a bit of ammonia) and it really helps get out the ink. Even when it seems I've cleaned my nibs thoroughly, a round in the sonic gizmo will release more ink.
There are "pen flush" solutions that you can use to help loosen and flush out ink. Use them after you've done all you can with water. Check Anderson Pens or the Goulet Pen Company or any site that sells fountain pens and ink. You can get a bulb syringe to move the flush through with a little more force that you'll get with a converter. The flush can be reused until it turns quite dark. Do rinse the flush out after your pen is clean. Most versions contain lubricant that will help your pen function, but anything more than a trace amount left in the converter of feed may make your ink flow more quickly than you'd like.
Let us know if that helps.
Any luck with your clogged nibs? I know they can be incredibly frustrating.
Ruth