Struggling to get solder to flow? Before you blame your iron, check the tip. A dirty or oxidized tip can't transfer heat properly, which is the #1 reason beginners think their iron is "broken."

The fix is quick: keep the tip clean with brass wool or a damp sponge, and keep it tinned with a thin layer of fresh solder. Do it when you start a job and again before you store the iron, and your tips will last dramatically longer.

Full step-by-step guide here: https://www.ifixit.com/Guide/How+to+Clean+and+Tin+a+Soldering+Iron+Tip/175931