this has been discussed many times before, but since the archives are down, i would like to ask, how can the grey stain from EIS be removed? i use a hudson ultrasonic humidifier to nebulize cs for colds, etc., and it works great. but the tank on the machine is getting pretty grey lookin. anyone with a good technique for removin the stain? it seems that hydrogen peroxide was used by some users. any suggestions appreciated deeply. thanks, jim
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