If you are familiar with this already, you can ignore the advice.
After each soldering, it helps to coat the tip with some solder just before or after you turn the iron off. The same could be done when taking breaks as well.
This can help the tip to last much longer, as it has a protection layer against oxidation. As for cleaning (just before the soldering), you can use brass shaving type of tip cleaner, or a wet sponge, or even both. Just make sure that the iron is not left on for a while without any solder on it.
For me, those tips have significantly improved tip lifetime of very cheap soldering irons.