Did this and other things as well. It definitely helped. I’ve gotten it clean several times, but any time you don’t run it for a certain amount of time the sludge comes right back. I don’t want to have to maintain a tub in that way. Even with frequent use the water would be contaminated with days old water. I don’t even really enjoy the jets, and after scrubbing all that seaweed lookin’ stuff so many times I don’t think I could ever be comfortable bathing in it the way it is. Definitely not worth it to me to try and keep it.