I have been using vinegar in place of softener for 3 years with no tub damage if that is what you are worried about. Vinegar is not a high acid and you will be diluting it with the rinse water. I have to admit if you have one of the new front loaders that use very water I do not know. My daughter has a very expensive front loader and it showed me I would never buy one. She is also agreeing that her clothes are not getting as clean as the did in her old washer
There is a class action lawsuit for those washers getting mold that is paying out right now.
Here: http://www.cbsnews.com/news/own-one-of-these-washers-you-may-be-eligible-for-money/
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