Cleanliness is key when soldering. It’s good practice to clean the iron. Simply heat the iron and wipe it on a damp piece of tissue paper and you should see the tip of the iron become shiny again with a good coat of solder on it. If this doesn’t work, try letting it cool down and clean it with a piece of wet and dry paper. Once you’ve cleaned the tip, try using some flux to chemically clean the tip, then melt a little solder on to the iron and spread the solder around on a damp piece of tissue, then you should have a clean soldering iron tip.
For more Skill Shack with Practical Classics tips, check out our Classic Car Electrics course.