Hi Chris-quilts,
I would try 'LaFrance' bluing. They still make it and it always did a good job when my kids were little. Of course follow directions and do not pour it directly on fabric. Put it in the water to desolve first before the cloth is added.
We lived in a house with rusty water and it kept the whites white and the colors bright.
I still use it but the kids are grown.
Quilter68