Still working on the electronics for the 3d printer, my overdue thing a week, so posting another tip I’ve just discovered regarding cleaning a soldering iron tip quickly. Simply remove the tip, place it very carefully in the chuck of a cordless drill and spin it against some sandpaper. I’ve only a cheap iron so no qualms over doing this, for fancier irons you may want to think twice.
There may be good reasons for this being a bad idea and if so feel free to get in touch, until then it seems to work a treat!
Hope this helps and that I’ve the damn electronics finished soon!