bearisgray

I don't have any more suggestions for what you might do now, but hope you get the white whitened again.

I used to "just wash" fabric - but did have an occasional bleed, even when I did that.

Now I soak the fabrics in hot water (gasp!!!!) for at least three hours (like colors together - just in case one of them has bad manners) before washing them gently. I usually add a drop or two of Dawn dishwashing detergent to the water.

When I'm on a washing "binge" - I have buckets, kettles, and the sink filled with soaking fabrics.

For the record, after this initial "abuse" - I handle my fabrics gently - short, cool water washes using mild/gentle detergent - the washer is not overloaded, gentle drying - again, not overloaded.

I feel that it is agitation and abrasion that makes fabric look worn/used - not soaking in hot water.

Using hot water does help release excess dye and increases shrinkage.

It is "a bit of a bother" before getting to the cutting and fun part of sewing - but I think dealing with a fade/bleed is a "bigger bother"