I’ve last-resorted to the ahh-some jetted tub cleaner for my in-home whirlpool tub after MANY (ive probably filled and cleaned over 20 times over the course of) other attempted cleaning regimens (dishwasher liquid soap, bleach, vinegar, whirl-out, you name it). I have got to purge number 3 with this Ahh-Some and there is this never ending green ring that lines the waterline in the tub. I’ve wiped it out relentlessly during each purge, rinsed and wiped the tub clean, and still it stays. Purge after purge. What am I doing wrong? Has anyone else seen this bright green ring? Any ideas as to what it may be? Help!