Heat up the iso via hot water bath. (no open flames near alcohol!)
heat a pot of water to near boiling with a washcloth, then take it off heat and turn off the burner. Run warm water over a small glass or jar until it is warm (to avoid shocking and shattering the glass), then place it in the water with enough alcohol in the jar to meet the water line.
After a few minutes, use this warm iso to clean your wand and you will have much better results, esp. with salt.