Spec me a Soldering Iron

I recently acquired a basic 40W soldering iron. First time i used it the nib had no issues accepting the solder. However now its rubbish, i cant solder anything with it.

The nib looks dark and dirty, even though i've tried to keep it clean as possible. Should i file down the nib to clean it? Or get a new nib? How long should a nib last?

Get a tub of tip tinner, first result on google. Grind the hot tip into it. Tip comes out like new.

The holder I use for the metcal also comes with a brass tip cleaner as well as the sponge. Works wonders.
 
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