Not sure what brand you have or exactly how yours works. But---I also have a "warm steam" vaporizer we use with the grand kids. I have also soaked the "warming chamber thingy" in vinegar and it still not work. Then I take it apart and use a small (tooth brush size) brass brush to clean off the carbon rods/electrodes and it goes to working again. I'm thinking that there could be a coating of something on these that a "normal" soaking of vinegar will not remove. Hope this helps.