This....^^^
A good multi hour soak in White Vinegar, maybe a few soaks...
And use Distilled Water, spring / well water will still have some minerals in it...
I have to run a humidifier in my snake room in the winter, tap & spring water made a mess with the minerals, everything gets a white dusting
Distilled water leaves no mess at all in the room and I have to wipe out the humidifier every couple weeks for an easy clean