I had also noticed that my Molotow pen mainly the 1mm, was not flowing as well as it once did and the chrome didn’t seem as shiny as before. So what I did was pull the nib out, remove the chrome piece, unscrew the black part and remove the clear round thing with the spring in the center where you would refill the pen at and I soaked all the pieces in 91% isopropyl alcohol. I also put some of the alcohol in a spray bottle so I could spray the nib down good and remove all the chrome from it. Doing this turns the nib back to a white color. After everything was completely cleaned and dried good I put it back together. When you do this it’s just like opening up a new one. You have to shake well and prime the nib again by pushing down on it a few times. Doing this restored its performance back like it was brand new again. So, if your pen stops working properly for you, maybe try this out. Hope this helps someone.