I have read many articles regarding this subject and none have worked - otherwise I would not have made a thread that is surely a dupe of many others on this site.
I purchased this 25W soldering iron a few days ago and used it for the first time without any problems. A few days later I tried using the iron again and the solder would not "stick" to the tip when I attempted to tin it.
I read up on this subject and thought that the tip might be dirty. So, I went about cleaning it. I tried to use a wet sponge when the iron was hot. This worked nicely, and the iron looked great! However, the solder still would not stick. So I then tried using a brillo-type pad to clean it. Yet again, the iron came out looking great but nothing would stick to it.
Here is an image of the clean iron:
I am not sure what to do. Any suggestions?