HE washer...whites turning gray.
I have a Bosch front loader which I bought when I moved to the country and for the first time have a septic system. I wanted a machine that used less water, as I do a lot of laundry. But, I find that now my whites are turning gray, and I don't know if it's due to hard water, minerals, etc. My question is, can I use the vinegar solution or Oxyclean solution in my HE washer, and, more importantly, since it uses such a small amount of detergent, how much vinegar or oxyclean should I use? I can't imagine using a half cup, as is stated for traditional top loaders. Thank you for your help!