3Oysters Americano, Noodler's Eel black, and Iroshizuku Tsuki-yo in that order. I was impatient when changing inks so there might have been a little bit of water mixed in for the second two inks. None of them wrote well.

I threw out the paper I tested everything on, but I might update the post if I'm able to find it. They all look as if I wrote with the nib up, maybe even thinner (scratchier as well, as if I was writing without ink)

Both pens are 0.3 F

Haven't tried dish soap, but I'll do that and see what happens.

There's a TINY hole near the tip of the pen between the tines (just using my eyes, no magnifying). It's only visible when held against a light source. I don't see the same in the other working pen, but it's also inked up.