This cloth is magic, if you are restoring or even just cleaning up a new pen, buy this.
I didn’t think a cloth could make such a difference, but within in a few wipes on a vintage Conklin endura nib I was blown away, it looks brand new. Sparkly, shiny, you name it. Some gentle brushing of the cloth on the clip and cap bands brung the shine right back. Just be aware, excessive use could possibly strip the finish off of vintage parts and reveal brassing. Go slow and you will not be disappointed.