How to make your own eco-friendly homemade laundry booster to brighten laundry. Wash your clothes as usual with detergent, but add in 1/4 cup of this booster for a more thorough cleaning.
Homemade Bleach Alternative
10 tips on using vinegar for laundry (including getting rid of yellowed items & color brightening)
I don't have any yet but ... Wash your towels in hot water with a cup of vinegar, and then run again in hot water with a half-cup of baking soda. That will strip your towels from all of that residue and mildew smell and will actually leave them feeling fluffy and smelling fresh. (Do not add laundry detergent to either wash. Just once with vinegar and once with baking soda.) good to know for the future.