This little 20oz bottle of Dr. Ph Martin's "Bombay Pen Cleaner" has worked wonders on my nibs. I do a fair amount of inking with a Japanese maru-style mapping nib, which allows me to pack in a fair amount of detail into my works. The only issue is that if I am working outside, particularly when it is hot or the wind is blowing, a fair amount of residual ink tends to dry on the nib. This little bottle of pen cleaner cleans off the ink — bringing my nibs back to life and saving a fair amount of money (for replacement nibs) in the process. I can't recommend this product enough!